Centrifugal andTurbine Typesfor ALL DutiesThere is a Pulsometer Pump for Eoery Purpose!FOR CHEMICAL INDUSTRIESSTONEWARE and SPECIAL METAL TYPESCover Wide Range of DutiesEqual to any Chemical Pump onthe World MarketStOneWWe PtlmpS in which interiorparts are of high quality non-porousacid-pmf stoneware which is able towithstand high temperatures and willnot discolour or contaminate liquids.Will bandle rn& hot or cold corrosiveliquids wlthout injury to the pump.SPCcial Metal Types of -4ustenitic (' &dton )) stonewareBritish Pump. Free from gland trouble. Steel or other corrosion-resistingmetal adapted to the liquid to beList No. 2764. -- 0 0 C c ) ~ Z ~ C I I I ~ ~ VACUUM" Pulsometer " Geryk HighVacuum Pumps are of simpleconstruction with fast pumpingspeeds and absolute certaintyof action, and practically end-less life.CAPACITIES :2 to 250 cubic feetper minuteVACUA OBTAINABLEd perfectSingle Stage *005 m.m.Duplex up to *ooOOl m.m.ROTARY ORRECIPROCATINGPUMPSFOR FACTORYOR LABORATORYin any size or typeForHigh VacuuaDisplacementDesiccationDistillationMoist Air Circuits1Propyl DimethylButyl DiethylDiamyl Amy1Diacetone DihexylPHTH ALATES Dibutyl ALCOHOLS lsobutylMethylEthyl ACETATES But,,,AcetaldehydeButraldeh ydePara1 d e h y d eALDEHYDES CrotonaldehydeAmy1 AldolACETONE ACETIC ACID TRlACETlNACETIC ANHYDRIDE DlACETlNAceto acetic esterMesityl OxideDiethylOXALATES DibutylEthylAmy1LACTATES ~ u t y lButyl Diethyl STEARATES Amyl TARTRATES D i bu tylEthylOLEATES ButylTributyl CITRATES TriamylThey are all manufactured in England by :BRITISH INDUSTRIAL SOLVENTS LTD,WELBECK HOUSE, DOWNS SIDE.BELMONT. SURREY - TELEPHONE: VIGILANT 0133-6...11iv @ c p.3.LL these products pass the most exhaustive tests in A the Bakelite Laboratories before they are releasedfor use, and the fullest possible information concerningtheir chemical and physical properties and the tests fheyhave undergone is available to users. Enquiries shouldbe addressed to Bakelite Limited, 18 Grosvenor Gardens,London, S . W. r. Telephone : Sloane ggr 1:.Pimeers in the Plastics WorldTI 0SOUTH=WEST ESSEX TECHNICALCOLLEGE AND SCHOOL OF ART(Essex Education Corn m i ttee)FOREST ROAD, WALTHAMSTOW, E.17H.LOWERY, M.Ed., Ph.D., D.Sc., F.1nst.P.SCIENCE DEPARTMENTHead of Department :R. W. JUKES, B.Sc., A.R.I.C., F.C.S.Senior Lecturer in Chemistry :H. HOLNESS, M.Sc., A.R.I.C., M.I.T.Senior Lecturer in Physics :J. BOR, M.Sc.Tech., F.1nst.P.W. B. CROW, Ph.D., D.Sc.Principal :Senior Lecturer in Biology :l~,~ 1Full-time Day Courses extending over 3 or 4 years areheld in preparation for the London University B.Sc.,General and Special Degrees in Chemistry, Physics, Botany,Zoology, and Mathematics ; also for A.R.I.C. and A.1nst.P.Many research investigations are in progress in theScience Department and students may become associatedwith any of these with a view to taking either the M.Sc.or Ph.D.Degree.Part-time Degree and National Certificate Courses arealso available in Science subjects.Special facilities are available for the study of industrialapplications of science, e.g. , plastics, radiology, electronics,chemical engineering.The College was opened in 1938 and replaces the formerLeyton and Walthamstow Technical Colleges.The building is entirely new and the equipment up-to-date. In addition to excellent teaching accommodation,the College possesses ample social amenities, viz., concerthall with cinema and stage, swimming bath, two gymnasia,library, refectory, writing and private study rooms, andcommon rooms.Full particulars and Prospectus of classes may be obtainedon application to the Principal.'viTHE POLYTECHNICRegent Street London, W.1 1 DEPARTMENT OF CHEMISTRY & BIOLOGYHead ofDepartment : H. LAMBOURNE, M.A., M.Sc., F.R.I.C.DAY AND EVENING COURSESB.Sc. Degree Special and General (External), LondonAssociateship of the Institute of Chemistry (A.R.T.C.)First Medical, Pre-Medical and Preliminary ScientificI 1 University.’Diploma.Courses in Chemistry, Biology and Physics.Prospectus free on application to theDirector of EducationThe heart of England is the home of LimestoneDERBYSHIRE STONE L T DControlling twelve large Quarries inDerbyshire & North Staffordshire, osersCARBONIFEROUS LIMESTONEof high CaCO, content for Chemicaland Metallurgical Processes - andLIMESTONE POWDERfor most cc Filling ” RequirementsBANK HOUSE MATLOCK DERBYSHIRETelephone : Matlock 396 Telegrams : Derbystone MatlockviiGLYCERINEThe Purest Qualityon t h e Market.~~Chemically Pure B.P.0 Pale Straw 0Produced by8t C O M P A N Y , L I M I T E D ,Newcastle, Manchester and LondonTHOMAS H E D L E YUNIVERSITY OF ST.ANDREWS (SCOTLAND)ChartccuW: The Right Hon. The EARL BALDWIN OF BEWDLEY.Viu-ChanceUor and Principal: SIR JAMES COLQUHOUN IRVINE.Dean of the Facuitv of Science: Professor ROBERT TAMES DOUGLAS GRAHAM.Recfor : Air Vice-Marshal SIR DAVID MUNRO.- Secretary bf ihe university: DAVID JOSEPR BURTON RITCHIE.The University confers the following Degrees, all open to men or women :B.Sc. (Ord. and Hons.), Ph.D., D.Sc.SESSION 1944-45 opens 10th October, 1944. The curriculum for Pure Sciencem a p be taken in St.Andrews or Dundee; the curriculum for Engineering inDundee. Application for admission to the Faculty should be sent to the Dean notlater than 30th June.Residential Entrance Scholarships for Men and Entrance Bursary Competitions-June annually. Entries due 3rd May. United College, St. Andrews.-ResidentialEntrance Scholarships-Seven of LIOO per annum tenable for 3 or 4 years. Bursariesopen to Science Students-Five of l50, one of €40, three of L30, four of lesser amountsfrom Lz5 t o &I-+, tenable for 3 or 4 years. University College, Dundee-Bursaries opento Science Students-Ten of from €50 to €30, tenable for 3 or 4 years.Preliminary Examinations.-March and August. Entries due 7th February and zIstJuly.Post-Graduate Study and Research in Chemistry, Mathematics, Astronomy, PjaturalPhilosophy, Zoology, Botany, Geology, Anatomy, Physiology, Engineerihg.Provisionmade for duly qualified Research Workers. Students of the University are eligible forCarnegie Trust Scholarships and Fellowships and for other Scholarships, Fellowships andGrants.Matheson Chemistry Scholarships and Bursaties.-A Scholarship of &roo for entrantstudents for three years and a Bursaryof €30 for students entering the Honours ChemistryClass, for one year, tenable a t United College, St. Andrews.Chemistry Research Students should communicate with Professor Read, United College,or Professor Wynne- Jones, University College, Dundee.Residence Halls for Men Students a t St. Andrews.-St.Salvator’s Hall, Dean’s Court,Swallowgate.Full information may be obtained from the &re of the University, St. Andrews,or the Dean of the Faculty of Science, Bute M%d Buildings, St. AndrewsTHEROYAL INSTITUTE OF CHEMISTRYOF GREAT BRITAIN AND IRELANDThe Institute of Chemistry was established in 1877 to providethe Government and the public with the means of recognis-ing those who have been properly trained and proved to becompetent to practise chemistry as a profession. In 1885 theInstitute was granted a Royal Charter with authority to grantcertificates of competency, and to register persons qualifiedto practise. The aims of the Institute include the elevationof the profession of chemistry and the maintenance of theefficiency, integrity and usefulness of persons practising thesame, by compelling the observance of strict rules ofmembership, and by setting up a high standard of scientificand practical efficiency.Particulars of the Regulations and Examinations of theInstitute can be obtained (free) on application.All communications to be addressed to the Registrar,THE ROYAL INSTITUTE OF CHEMISTRY30 RUSSELL SQUARE, W.C.1Large departments for Books onChemistry, Physics and all Branchesof Science.FOYLESBOOKSNew and Second-hand Books onEvery Subject. Nearly 3 millionVolumes in Stock. Books Bought.119-125 CHARING CROSS ROAD,LONDON, W.C.2Open g a . m . 4 p.m., induding Saturday.T e l c p h c : GERrard 5660 (16 lines).XThe fact that goodsmade of raw materialsin short supply owingto war conditions areadvertised in this Bookshould not be takenas an indication thatthey are necessarilyavailable for exportTHE DERBYSHIRE SILICA FIREBRICK CO., LTD.FRIDEN - HARTINCTON - Nr.BUXTONManufacturers of theHIGHEST GRADE REFRACTORIESFOR THECHEMICAL, CARBONIZING AND STEELINDUSTRIESand WATER TUBE BOILERSGas-fired wire patenting Furnace built with D.S.F. Bricks and Insulated with" Dome " Insulating BricksU S E" DOME " BRAND INSULATING BRICKSFOR FUEL CONSERVATIONManufactured by the D.S.F. Co., Ltd.Telegrams : Telephone:" Silica," Friden, Hartington Hartington 230xTHE EDWARDS TYPE IVCOMPRESSOR AND VACUUMPUMPVACUUM : - - - - - 24 inches Hg.DISPLACEMENT: 3 cubic feet per minute.PRESSURE:- - - - - - -1Olbs.This general-purpose ’ o u t f i t fulfils long-standing require-ments i n works and laboratories.It is compact and quiet,and can be easily adapted to meet special needs.BLOWPIPES FILTRATIONSSPRAY IN GASPIRATING, etc.CI RCULATIN GW. EDWARDS & CO. (London) LTD.KANGLEY BRIDGE ROAD, LOWER SYDENHAMLONDON, S.E.26Telephone: Telegrams :SYDenham 7026 (P.B.X.) Edcohivac, Phone, LondonNOW OR POST WARIf you have a Problem in Constructionfor Acid Handling, Storage, Processing,Protection of Structures or Plant . . .. . . you can save time, money and critical materialsand have better all-round results by putting it up t o us.P rod0 ri te Com p lete Service includes--Materials of Construction-Ti m e- p r o v e n D es i g n s-A full Contracts Departmentand-Supervision of Construction.Our Chemical Engineering Department i s ready t o co-operate with drawings and estimates.Our representa-tives are technically trained and can discuss your needsconstructively. Our Laboratory and Consulting Serviceis available for all types of acid-proofing problems.Our war effort has been 100% all the time.HEAD OFFICE:EAGLEWORKSWED N ES BU RYPhone : WEDnesbury 0284(Pri, Br. Exchange)ARTILLERYHOUSEARTILLERYROWLONDONS.W. IPhone : ~ABBey 1547 & 1548xii“Euerythhg for Safety Eve ywbere ’’S E L F - C O N T A I N E DBREATHINGAPPARATUSof all types including‘‘ PROTO ” ‘‘ SALVUS ” & ‘‘ FIREOX ”as used in Mines, Chemical Works, Fire Brigades, etc.GAS MASKS SMOKE HELMETS*‘ PURETHA ” and “ SPIRELMO ” and otherother types t Y Pes‘‘ NOVOX ” and “ NOVITA ”Resuscitating Apparatus for persons asphyxiated by poisongas, shock, drowning, etc.“ ANTIPOYS ”Short distance breathing apparatusASBESTOS, ACID & WATERPROOF CLOTHING,DUST HOODS, RESPIRATORS, GOGGLES andmany other protective and safety devicesSIEBE, GORMAN & CO.LTD.LONDON, S.E.Established I8 I9xi1xSCIENTIFIC BOOKSH. K. LEWIS & Co. Ltd.A very large selection of new and standard works in everyThe Department for Scientific Books, English and Foreign, is onthe first floor.Foreign Books not in stock obtained under Licence.Orders and Inquiries by Post promptly attended to.branch of Science always available.(Lift to First Floor).Underground : Euston Square, Warren Street. ‘Buses : Euston Road and TottenhamCourt Road.SCIENTIFIC LENDING LIBRARYAnnual Subscription, Town or Country, from One GuineaThe LIBRARY is useful to SOCIETIES and INSTITUTIONS, andto those engaged on SPECIAL RESEARCH WORK, etc. TheLibrary includes all Recent and Standard Works in all branches ofMedical and General Science.Reading and Writing Room (first floor) open daily.New Books and New Editions are added to the Library and areavailable to Subscribers immediately on publication.Catalogue of the Library, revised to December 1943 ; containingthe titles of books arranged in alphabetical order under the Author’snames, with size, price and date, and an Index of Subjects with thenames of the Authors who have written on them. [In the Press.Quarterly List of New Books and New Editions is issued free to allSubscribers and Book buyers regularly .Detailed Prospectus on Application,Every work is the latest edition.STATIONERY DEPARTMENT : Scientgc and General.Loose-Leaf NotebooAy, Record Cards, Filing Cabinets,Slide Rules, Graph-papers, etc.SECONDjHAND BOOKS : 140 COWER STREET.Large and uaried siock.Books not in stock sought for, and reported when found.H m K m LEWIS & Coo LtdoPUBLISHERS AND BOOKSELLERS136 GOWER STREET, LONDON, WmCmlTelegrams : Telephone :‘PUBLICAVIT, WESTCENT, LONDON.’ EUSton 4282 (5 lines)xv