A New Course in Practical ChemistryINORGANIC PREPARATIONSB y A. KING, MSc., A.R.C.S., D.I.C., of the Chemistry Department af the Imperial College ofScience. A logical arrangement of experiments with sufficient theoretical matter for the studentto correlate theory with practice. Detailed directions for about 190 preparations, and about anequal number briefly sketched. 5s. 6d. net.CHEMICAL CALCULATIONS : THEIR THEORY AND PRACTICEBy A. KING, MSc., and Dr. J. S . ANDERSON. With 500 problems, half with answers and halfwithout. For the first year students in Universities and higher classes in Srhools. 4s. 6d. net.GERMAN-ENGLISH CYEMICAL TERMINOLOGYBy A. KING, MSc., and Dr. H. FROYHERZ.English and German.An introduction to Chemistry in parallel texts ofIn Murby’s series of German-English Terminologies.12s. 6d. net.SOIL ANALYSIS : A Handbook of Physical and Chemical MethodsBy C , H. WRIGHT, M.A., F.I.C., former Senior Agricultural Chemist, Nigeria. 12s. 6d. net.B y the Same AuthorAGRICULTURAL ANALYSISSILICATE ANALYSIS : A Manual for Geologists and Chemists, withA book on this subject is in the press and will be published in the spring.Chapters on Check Calculations and Geo-Chemical DataBy A. W. GROVES, D.Sc., Ph.D., D.I.C., F.G.S. I n the Press. Probable price 12s. 6d. net.ELEMENTARY CRY STALL0 GRAPHYBy J. W. EVAKS, DSc., F.R.S., and G. M. DAVIES, M.Sc., F.G.S. 7s. 6d.Send for List o Hooks and Models for Crystallography.THOMAS MURBY & Go., 1 Fleet Lane, London, E.C.4APPOINTMENTS BOARDof theIMPERIAL COLLEGE OF SCIENCE & TECHNOLOGYSouth Kensington, S.W. 7Iiacluding :CITY AND GUILDS COLLEGE.ROYAL COLLEGE O F SCIENCE, ROYAL SCHOOL OF MINES,EMPLOYERS requiring graduates trained in scientific or technical studiesare asked to make use of the services of the Board.In the Chemical Department students are trained in Inorganic, Organicand Physical Chemistry, with special attention to analytical methods,and graduates who hate done postgraduate research work in one of thesebranches, and in Agricultural Chemistry, are available.In the Department of Chemical Technology, the post-graduate cour5esinclude instruction and rcsearch in the Chemistry of Fuel and Combustion,Reactions under High Pressure Catalysis, Chemical Engineering, etc.The services of the Board are free, and the Registrar will be pleased todeal with any enquiry.Employers can be put into direct communicationwith the Professor respecting any student considered for an appointment,so that first-hand information as regards suitability for the work proposedcan be obtained.Enquiries should in the first instance be addressed to the Registrar,Imperial College Appointments Board, Prince Consort Road, S.W. 7. 1iWILLIAM BOBY & CO. LTD.Established 7875WATER PURIFICATIONENGINEERSMakers of" S I M P L E X"Lime-Soda Water Softening Plantsand"AZE D"Base Exchange Softening Plants forIndustrial and Municipal requirements.Plants for Filtration, CoIour Removal and Softening ofRiver Waters.Automatic pH correction equipment.Plants for softening and conditioning feed water of alltypes of boilers, together with Continuous BlowdownSystems.WILLIAM BOBY & CO.LTD.BROOKFIELD HOUSE62/64 BROOK STREET, LONDON, W.112443*IDI-at~Telegraphic Address :" Casthermo, Smith,London ." Terminus Telephone 2030. : 0 cQ40f 0nLP'The mark of precision and egciency.-BRITISH MADETHROUGHOUTIf you use heat-it pays to measure it accuratelyB.BLACK & SON, LTD.1, Green Terrace, Rosebery Avenue,LONDON, E.C.lThermometer Manufacturers(MERCURY IN GLASS T Y P E )Original Makers of the Improved, Gas-filled, Permanent Thermometers forLaboratory and Industrial Processes.Standard Thermometers of the highestaccuracy covering over a range fromminus 200 to plus 520° C.The black filling-in etchings will resistall solvents with the exception of thosethat attack the glass itself.The National Physical LaboratoryCertificates supplied, with any type.Of all the principal Scientgc Instrument and LaboratoryApparatus Manufacturers.vWe are manufacturers of a l l kinds ofFACT0 RY EQU I P M E NTL I Q U I D F I L L I N G M A C H I N E SApproved by Board of Trade Standards Department f o r Barrels,RUMBLING & CHAINING MACHINESFor the interior o f Barrels and Drums.AIR PRESSURE TESTING MACHINESFor Drums and Cans.WASHING & CLEANINQ MACHINESW i t h Patent Self-Rotating Nozzles f o r Barrels, Drums and Cans.C O A T I N Q & P A I N T I N G MACHINESFor the interior o f Barrels and Drums.VACUUM & PRESSURE RELIEF VALVESFor large Storage Tanks.SAFETY ELECTRIC HAND LAMPSW i t h Steel Alkaline, o r Lead Jelly Acid Accumulators.SAFETY ELECTRIC HAND TORCHESW i t h 3-Cell dry Battery and Spotlight Bulb.The above are approved by the Mines Department i n explosive atmospheresDrums and Cans.Special Machines built to customers’ own requirementsIllustrations and particulars o f the above machines and equipment sent on requestDOWNS ENGINEERING WORKS LTD.SOUTHFIELD ROAD, ACTON, LONDON, W.4Telephone: CHISWICK 2840/1ACID RESISTING CEMENTSPECIALISTS INFOR ACID AND ALKALI PROCESSESTHE LINING OF HIGH-PRESSURE DIGESTERSOur Linings withstand Direct Acid Proof Floors to with-Steam and Instant Cooling stand abrasion from Heavywithout Fracturing.Loads, etc.Cements, Bricks, Tiles, etc., for Our Products can be applied toAcid Storage Tanks, Pickling vessels of Iron, Wood, Brickwork,Vats, Bleaching Cisterns, etc. Concrete or Stone, etc.Used by the leading Chemical and Allied TradesF. HAWORTH LTD.PEEL BROW - RAMSBOTTOM - LANCS.TELEPHONE: RAMSBOTTOM 3242viiTHE 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 INSTITUTE OF CHEMISTRY30 Russell Square, W.C.1THE POLYTECHNIC, REGENT ST., W.1DEPARTMENT OF CHEMISTRY AND BIOLOGYHead of Department : H. LAMBOURNE, M.A., M.Sc., F.I.C.Day Courses:BSc. Degree Special ancl General (External), London University.Associateship of the Institute of Chemistry (L4.1.C,) Diploma.1st Medical, Pre-Medical and Preliminary Scientific Courses inChemistry, Biology, Physics.Evening Courses :( a ) B.Sc.Degree Special and General (External), X.I.C., Inter-mediate Science, Pre-Medical Course in Chemistry and Physics,National Certificates in Chemistry.( b ) Applied Courses in Gas Engineering and Manufacture; Pig-ments, Varnishes, Paints, Enamels and Cellulose Finishes ; Oils,Fats and Waxes.Full prospectus on application to the Director of Education.PHYSICAL CHEMISTRYBYJ. N. BRONSTED, Ph.D.Professor in Copenhagen UniversityTRANSLATED BYR. P. BELL, MA., Balliol College, OxfordDemy 8vo. 12/6 June, 1937A general text-book suitable for Univer-sity use, in which special stress is laidon the importance of a sound foundationin thermodynamics.The author's ownwork on the physical chemistry ofsolutions is a guarantee that the treat-ment of this subject is thoroughly up todate; the book is throughout character-ised by a modern approach and willsupply a long-felt want.Also translated by Mr. BELLINORGANIC CHEMISTRYBYNIELS BJERRUMDemy 8vo. 716 31 7 pp."A masterly treatment of its subjectmatter . . . embodies all the qualities ofa really first-class text-book . . . a mostup-to-date and useful survey of thatbranch of the science . . ."-Nature.HEINEmNN 99 GT. RUSSELL ST.,LONDON, W C.1xQUEEN MARYCOLLEGEOFARTS, SCIENCEANDENGINEERING(University of London)Principal :Maj.-General Sir Frederick Maurice,K.C.M.G.,C.B., LL.D., D.Lit.Provision is made for ResearchWork for Students preparingfor M.Sc., Ph.D.and D.Sc.Degrees in Chemistry. Theresearch laboratories are wellequipped with apparatus foradvanced work in Chemistry.Fees from $22 10s. a year.Halls of Residence for MenStudents and for WomenStudents.Prospectus Free on applicationto the REGISTRAR-QUEEN MARY COLLEGE, E.I.xii‘‘ Inimitable and certainly unsur-passable.” --Journal of Education.ORGANICCHEMISTRYBYF. STANLEY KIPPING,F. BARRY KIPPING,Ph.l)., Sc.D., F.R.S. andRIA., Ph.D.Parts I and I1 have been entirelyrevised and brought up to date.They cover all the ground necessaryfor a Pass Degree Examination.Part I11 is for Honours Degreecandidates and also for teachers andthose interested in the latest de-velopments of organic chemistry.Pt.1. 368 pp. 4’6. Pt. 11. 328pp. 416. Pts. I and 11. in one vol.8’6. Pt.111. 408 pp. 6‘-W. & R. CHAMBERS, LM.,38 Soh0 Square, London, W.lTelegrams: BELLAMY, PHONE, LONDONTelephone: EAST 1892JOHNBELLAMYLTD.43 BYNG STREET,MILLWALL, E. 14Makers of TANKS, MIXERS,AUTOCLAVES, etc., i n Mildand Stainless Steel to suitthe special requirements ofthe CHEMICAL MANU-FACTURERSSPECIAL ATTENTION TOINDIVIDUAL DESIGNPURIFICATIONOFWATERFOR ALL PURPOSESBOILER FEEDPROCESS WORKTEXTILE PURPOSESTOWN SUPPLY, Etc.IS THE SPECIALITY OFL 'EN N I COT'WATER SOFTENERWO LV E RHA M PTO NCO., LTD.Established 40 YearsPLACE YOUR WATER PROBLEMSBEFORE US AND AVAIL YOUR-SELF OF OURUnrivalled ExperienceManufacturers of Domestic Water SoftenersTo face title page. xi