320 BOARD OF AGRICULTURE. 



This guano contained 7.75 per cent, of nitrogen, whilst 4.18 

 per cent, of the nitrogen of the fish was found in the soup. 

 The fat in the soup amounted only to 1.10 per cent. ; 4 parts 

 of the fish had produced 3.3 parts of soup. 



Our fish-rendering establishments discharge the soup. 

 Manufacturers in Norway turn the latter to account for the 

 manufacture of a low quality of glue, after the fat has been 

 collected. 



The glue obtained contained from 7 to 8 percent, of nitrogen, 

 and, after grinding, can be applied with advantage for fertil- 

 izing purposes. 



Messrs. Demolen & Thurmeyssen introduced the fish guano 

 manufacture into France about the same time, or shortly 

 afterwards, as Pettit in England. Their establishments were 

 situated at Concarneau, in France, where a species of sardines 

 is worked into guano. The composition of their articles is 

 noted by Pay en as containing 11.6 per cent, in nitrogen and 

 10.3 per cent, of phosphoric acid. The fat in the guano 

 amounted only to 2.5 per cent. Germany receives of late a 

 large supply of excellent fish guano from establishments along 

 the Baltic Sea, and also from the more northerly located 

 Norwegian fisheries upon the Lofoten Islands. The Nor- 

 weirian fish guano is derived from two sources : the head and 

 the backs of the codfish (stockfish), and also from the flesh 

 and the bones of the polar fish. The guano from the first- 

 named source is at present so highly improved that the manu- 

 fticturers are enabled to guarantee from 11 to 12 per cent, of 

 nitrogen, and from 5 to 6 per cent, of phosphoric acid. In 

 1870 the average composition did not differ much, as a general 

 rule, from 8 per cent, of nitrogen and 12.8 per cent, of phos- 

 phoric acid ; commercially considered, a ditference of $10 per 

 ton in favor of the former. The polar fish or whale guano is 

 obtained from the rendered flesh and bones of the entire 

 whale. 



The composition of the whale guano is guaranteed to be 8 

 per cent, of nitrogen and 12 per cent, of phosphoric acid. 



The following analytical results of A. Stockhardt, regarding 

 the composition of the flesh and the bones of the whale, may 

 not be without interest in this connection : — 



