Fish Manures, 21 



the method of Fresenius. The nitrogen of the organic matter 

 was estimated by the direct method of burning a portion of the 

 dried substance with soda lime, and weighing the disengaged am- 

 monia as ammonia-chlorid of platinum. The results were as follows 

 for a hundred parts : — 



I. II. 



Phosphoric acid, 3-40 3-99 



Sulphuric acid, 2.16 -15 



Lime, 5-90 4*44 



Magnesia, . 1-20 T15 



Ammonia, 3 76 2-60 



If we calculate the value of the fi st specimen according to the 

 rules already laid down, we have as follows for 100 pounds : — 



Phosphoric acid, 3 4 pounds aft 4^ cents,. . . . $0-153 

 Ammonia 3| pounds at 14 cents, 0*525 



$0-678 



At 68 cents the 100 pounds, this manure would be worth 813.60 

 the ton. The sulphuric acid is of small value, corresponding to 

 SO pounds of plaster of Paris to the ton, and we do not take it 

 into the calculation. The somewhat larger amount of phosphoric 

 acid in the second specimen, is probably derived in part from the 

 ashes of the saw-dust, and in part from the clay. The value of 

 tliis manure would be $10-88 the ton. 



In order to arrive at the real value of the animal portion of this 

 manure after the removal of the oil, w r e may suppose, since Dr. 

 Keid obtained from the shales from 4'5 to 7 6 per cent, of fixed 

 carbon, that with the 56.2 parts of calcined" residue, there were 

 orio-inally 3*7 parts <*f carbon derived from the shales. This de- 

 ducted from 23'7 parts leaves 20*0 of nitroorenized animal matter 

 in 100 parts of the manure, yielding 3-76 parts, or 18*8 per cent, 

 of ammonia. This matter consists chiefly of muscular and gelatinous 

 tissues, and Paycn obtained from the dried muscle of the cod-fi-h, 

 lb'S per cent, of nitrogen, equal to 20-4 of ammonia. The 24-4 

 parts of phosphoric acid in the mannre will correspond to 7-4 of 

 bone-phosphate, and if to this we add for moisture, impurities, 

 etc., 26 parts, = 3*00 in all, we should have fur 100 pounds of 



