22 Cincinjiati Society of Natural History. 



Sulphuric Acid 196 



Calcium Cloride 222 



Magnesium Chloride 182 



Nitric Acid 189 



Barium Chloride 208 



Bicarbonate of Lime 100 



Calcium Sulphate 136 



Bicarbonate of Magnesia 84 



Magnesium Sulphate 75.5 



Copper Sulphate 31" 



Ferrous Sulphate 22 



Ferrous Bi-sulphate 17 



Alum 7 



Aluminium Chloride 4 



Ferric Chloride 2 



4 

 92 

 48 

 74 



Al.UM. 



The Chinese, ' according to Sherard Osborne, use alum for 

 the purpose of ]jurifying the water of the Peiho at Tien-tsin, and, 

 as shown by their traditions, they have used it for centuries on the 

 waters of that and other interior rivers of China. 



This substance so long known is still in the front rank of 

 practical agents used for the clarification of liquids containing sus- 

 pended impurities. It is used in many industries. The manufac- 

 turer of Common Salt who works ferruginous brines, after separat- 

 ing peroxide of iron by boiling, finds alum both the cheapest and 

 most efficient agent for clarifying the salt water. 



It is used by the chemist, the pharmacist, the brewer, the 

 manufacturer of effervescent beverages, and many others who re- 

 cpiire clear water and* whose supply comes from turbid streams. 



Aleumenoids. 



Liquids may be separated from suspended solids by the action 

 of abuminous substances. This is ]jractically done in the indus- 

 trial way by dissolving the albumenoid in the im])ure li(|uid, and 

 then coagulating the mass by the action of heat or an astringent 

 mineral. 



Syru])s are mixed with the all)umen of eggs, blood and milk 

 in the cold and then heated to l)oiling. 'I'he heat coagulates the 

 albumen about the solids and the ascending steam carries the 



I. Water analysis. Wuaklyn's Purification of \\'atcr, and American Journal of 

 Science, January, 18S5.— Brewer. 



