@ti4 INCLUDING &uaIgfit, THE PROCEEDINGS OFTHE ANALY~T . . . . . . 1The Society of Public Analysts . , . 1On the Detection and Estimation of Alum inWheat Flour, by D ~ . ~ ~ ~ ~ 6 , F.R,S. . . 1On the Detection of Alum in Flour by theLogwood Test, by W. C. Young, F.C.S.Stoddart, F.1.C. . . . . . 7On the Nitrogenous Constituents of Cocoa, by a. W. Wiper, F.C.S. . . . . 8On the Logwood Test for Alum, by W. W.THE “ SOCIETY OF PUBLIC ANALYSTS.”On a Ferment produced by growth ofBioplasm of Yolk of Egg, by W. Thomeon,F. R.S.E. . . oAmount of Solids ih Miik, by’C. k Cameron,M.D.. . . . . . . . 11. 1 1 ReviewsCorrespondence 12Law Re orta . . . . . 1 2Notes o!the Month‘ . . . . . 16ChemicalPatenta . . . . . . 18Books Re2eived . . . . . .18. . . . . . . . . . . .A. H. ALLEN, F.C.S.A. D u P ~ ’ , PH.D., F.R.S., F.C.S.C. HETSCH, F.C.S.M. JACKSON & Co.,J. MUTER, €%.?I., MA., F.C.S.GI. W. WIGNER, B.C.S.(J. ORME & H. M. CAPNER,)A. WYNTEE BLYTH, M.R.C.S.C. A. CAMERON, M.D.Orno HEHNER, F.C.S.65, BARBICAN, LONDON,-MANUFACTURERS AND IMPORTERS,E. W. T. JONES, F.C.S.J. FALCONER KING, F.C.S.C. H. PLESSE, F.C.S.Every description of Apparatus for Lectures, Study, or Research kept in StockPURE CHEMICALS. -For Public Analysts we supply specially Pure Acidand Chemicals, which can be relied upon for uniform purity.or made to order at a few days’ notice. Be& Quality and reasonable prices.PRICE LIST Revised. Sent Post Free for Three StampsI ,d L , OERTLING,TURNMILL STREET(Opposite Farringdon Street Station,)CHEMICAL, ASSAY, & BULLIONMANUFACTUBEB OFBALAICES.I ‘ ~I+------ - ---8GEEMIGAL APPARATUS & SCIENTIFIC IASTRVIERTS.Porcelain, t%z88, Xtone, rood @nd Hetal Apparatzce forChimicat and Physiological Purposes and Leoturet~.Bunsen’s Modifled Filter Pumps, from 10s.8d. to 87s.SOLE AGENTS FOR GRENET’S BATTERIES.ELECTRICAL, MEDICAL & EXPERIMENTAL COILS & APPARATUB.ELECTRICAL BATTERIES AND ELEMENTS.cat&gum and Illmtratlons d l 1 be sent gratUitOUSlY. A liberal Discount allowed to WholeealeBuyers.WHOLESALE IMPORTERS AND MANUFACTURERS,AU(ji- =EL &G CO,,34, MAIDEN LANE, BTRAND,PURCHASERS OF THE STOCK OF A. & M. ZIMMERMAN.TOWNSON (QL; ME51RGER,(LATE JACKSON & TOWNSON),Wholesale and Export Dealers and Manufacturers of Chemical and Scientifio Apparatus,Graduated Inst.rurnenta, and Pure Chemicals for Analysis, &c.89, BISHOPSGCATE STREET WITHIN, LONDON.for England f r Becker’s Chemical Balances.Illustrated Catalogue post free on receipt of 3 stamps..4pparatns arran ed and Sole Agents for Prof. Wanklyn’a Test Solutions for Water Analysis. Sole AgentsBISCHOF’S PATENT SPONGY IRON FILTER.“ IN every w e a moat satisfactory reduction of organic matter.”-Reportof Royal Commission, 1875. “ This is a very satisfactory result.-RegistrarUeneral, 1876. “Removes entirely every trace of lead.”-Journal ofRoyal Agricultural Society,” 1875. “ The property which animal char-coal possesses in a high degree of favouring the growth of the low formsof organic life is a serious drawback to its use 88 a filtering medium forpotable waters.”-Royal Commission, 1875.NO ANIMAL CHARCOALReports are worthless ; those quoted above are the latest, aud have beengiven OFFICIALLY. Price of Filters, from 17s. 6d. each. Original reportsextracts, and all particulars at Dep6t, 505, OXFORD STREET,LONDON, W.C., or post free.IN THE IMPROVED SPONGY IRON FILTER- CAUTIoN.-obsoleteELECTRIC BELLSOn an Improved System, enabling any one to fix their own Belle.COMPLETE APPARATUS-Bell, Battery, Communicator and Wire, for Slls. only,Fire Alarms and Thief Detectors, Invalid’s Portable Bells from $1 1s. to $2 12s. 6d. Instructions anddiagrams for fixing apparatus, and price lists free. Illustrated catalogue of Surveying and Drawing Instm-mente forwarded on receipt of three stamps.a m W. 825 E m ARCEXISU’TZ’,Sent for 1s. extra, carnage paid, to any Railway Station in England. Hotels and Mansions fitted.8, Bridge Street, Westminatsr, facing the Houses of Parliament