172 THE ANALYST. PHOSPHO-(YITRIC ACID, A Preparation to 8zclperselEe Citric ma7 Tbrtarh Acid8 in Mhaeral Waters. BY J. NAPIBR, B.C,S. CITRIC and tartaric acids have long been used for acidulating or giving to mineral waf,ei*s their acid flavouring, but these acids have certain disadvantages, inasmuch as their solutions cannot bo kept for any groat length of time without the formation of a fungoid growth, and also the extreme difficulty of obtaining them free from lead, A solution has recently been offered to the trade called phospho-citric acid, intended to supersede citric and tartaric acids in mineral waters, a sample of which f have lately received, the composition of which, I have no doubt, mill interest analysts, It contains- Free Phosphoric Acid , , . , , , 34.34 per cent.Phos hafeof Magnesia ,, ,, ,. 1-86 j, Sulpl%e of Magnesia ,, .. , I 1.93 j j Bulphateof Lime ", ,, ,, ,, '66 ), Ironand Alumina ,. , , ,, ,, traces ,, Citrio Aoid ,, ., ,, ., ,. 6.60 ,, Water 6 , e , * * + * 54'82 9, - 100.00 -a Poisonous metals were entirely absent, and so also were free sulphuric, hydro- chloric, nitric, and acetic acids. The aolution was comparritively clear, and almost coloiirless. According to the proportions insbructed to be used, the quantity of phos- phoric acid in a small bottle (half-pint) will amount to *95 grains, which 1: found to be the case in a sample of lemoaade made with the above, The flavour and appearance mere quite as good as that made with the organic acids. Seeing that phosphoric acid has been largely urred, and appears to be highly valued for raising bread and pastry, and that it is recognised as an important medicinal consti- tuent to tho system, there is no reason why this article should not be used in this highly diluted form as tho acid flavouring of lemonado and other mineral waters.BOOKS, Lc., RECEIVED. Tho Cheniist and Druggist ; The Brewers' Guardian : The Briti8h Medical Journal : The Pharina- ceutioal Journal ; The Sanitary Rscord : The Miller ; The Provisioner ; The Practitioner ; New Remedies ; Proceedings of the American Chemical Society ; The Inventors' Record; New York Public Health ; The Scientific American ; Society of Arb Journal; Sanitary Engineer of New York ; Cowkeeper and Dairyman's Journal ; Sugar Cane ; Country Brewers' Gaxette ; The Medical Reoord ; The Grocers' Gazette ; London Water Supply, by Crookes, Odling and Tidy ; Chemical Review ; Independent Oil and Drug Journal and Paint Renew ; Science Monthly ; Journal of the Sooiety of Chemical Industry.