MISCELLANEOUS ANIMAL PROTEINS 281 



heads, tails, and the guts. Many fish are incidentally 

 caught which, being valueless as food, are yet useful as 

 manure. After the extraction of oil from fish livers the 

 residue is suitable for a similar purpose. These residues 

 are steamed, dried, and ground up, forming fish manure, 

 rich in nitrogen and often also in phosphate. 



REFERENCES. 



" Chemical Fertilizers and Parisiticides," S. H. Collins, M.Sc. 

 " Organic Nitrogen Fertilizers," Part III., Section II., p. 105. 

 " Fish Manure," p. no. 



