120 ECONOMICAL GEOLOGY. 



and purified from water and other substances by ether. It 

 then weighed 2.66 ounces; which is equivalent to 3.914 

 per cent, of the original weight of the fish. 



The substance of the fish remaining was then strained 

 out and carefully dried in an air-bath at a temperature of 

 290° Fah. ; when the dry mass was found to weigh 11.8 

 ounces. On account of the solvent power of the sulphuric 

 acid, which was added to the fish, it was thought proper to 

 separate all the mineral matters from the fluid in which 

 the fish had been boiled, and add them to the dried fish ; 

 excluding, of course, the sulphuric acid. These weighed 

 1.1 ounces; and added to the weight of the dried fish given 

 above, 11.8 ounces, made, for the whole weight of the dried 

 matter 12.9 ounces; which is equivalent to 18.936 per cent. 

 of the original weight of the fish. There was still left in 

 the fluid some animal matter, which could not be satisfac- 

 torily separated, and was left out. 



The water in the fish was 77.15 per cent., as ascertained 

 by deducting the percentages of oil and dry matter from 

 100. 



The nitrogen in the dried fish was ascertained by ulti- 

 mate analysis to be 7.762 per cent., which is equivalent to 

 9.282 per cent, of ammonia. 



The mineral substances contained in the fish were freed 

 from the organic matter by burning, and then separated 

 from each other by the ordinary processes of analysis. 



Analysis of the Fresh Fish. 



Water ; 77.150 



Oil 3.914 



Dried fish 18.936 



100.000 



