18 Fish Manures, 



thoroughly cooked, after which it is submitted to pressure, which 

 extracts the water and oil. The pressed mass is then rasped, 

 dried in a current of hot air, and ground to powder. 100 part9 

 of the recent offal yield on an average 22 parts of the powder, 

 besides from 2 to 2 £ parts of oil. The manufactory of Concarneau 

 employs six men and ten boys, and is able to work up daily eigh- 

 teen or twenty tons of fish, and produce from four to five tons of 

 the powdered manure. 



This manure contains, according to an average of several 

 analyses, 80.0 per cent, of organic matters, and 14.1 per cent, of 

 phosphates of lime and magnesia, besides some common salt, a 

 little carbonate of lime, small portions of sulphate and carbonate 

 of ammonia, and only 1.0 per cent of water. The nitrogen of 

 this manure, which is almost wholly in the form of organic mat- 

 ters, corresponds to 14.5 per cent of ammonia, and we may esti- 

 mate the phosphoric acid, which is here present in an insoluble 

 form, at 7.0 per cent. If we calculate the value of this manure 

 accoiding to the rules above laid down, we shall have as follows 

 for 100 pounds : — 



Ammonia, — 14£ pounds, at 14 cents, $2.03 



Phosphoric Acid, — 7 pounds, at 4| cents 0.31i 



$2.34J 



This is equal to $47 the ton of 2000 pounds ; the manufactured 

 product of Concarneau, however, according to Payen, is sold in 

 the nearest shipping ports at 20 francs the 100 kilogrammes, 

 (equal to 220 pounds), which, counting the franc at $0.20, is 

 equivalent only to $1.81, the 100 pounds, or a little over 8-37 the 

 ton. This however was in 1854, since which time the price of 

 manures has probably increased. 



Mr. Demolon in company with his brother, has also according 

 to Paven, erected a large establishment for the manufacture of 

 this manure on the coast of Newfoundland, at Kerpon, near the 

 eastern entrance of the Strait of Bellisle, in a harbor which is 

 greatly resorted to by the vessels engaged in the cod- fishery 

 This manufactory, now in successful operation, is able to produce 

 8,000 or 10,000 tons of manure annually. Paven estimates the 



7 7 » >J 



total yearly produce of the cod-fisheries of the North American 

 coast to be equal to about 1,500,000 tons of fresh fish ; of this ? 

 one-half is refuse, and is thrown into the sea or left to decay on 

 the shore, while if treated by the process of Demolon, it would 



