259 



The remaining parts of the 100 must be consi- 

 dered as decomposable animal matter. 



Horn is a still more powerful manure than bone, 

 as it contains a larger quantity of decomposable ani- 

 mal matter. From 50O grains of ox horn Mr. Hatch- 

 ett obtained only l- grains of earthy residuum, and 

 not quite half of this was phosphate of lime. The 

 shaving or turnings of horn form an excellent ma- 

 nure, though they are not sufficiently abundant to be 

 in common use. The animal matter in them seems 

 16 be of the nature of coagulated albumen, and it is 

 slowly rendered soluble by the action of water. The 

 earthy matter in horn, and still more that in bones, 

 prevents the too rapid decomposition of the animal 

 matter, and renders it very durable in its effects. 



Hair, woollen rags and feathers are all analogous 

 in composition, and principally consists of a substance 

 similar to albumen, united to gelatine. This is shewn 

 by the ingenious researches of Mr. Hatchett. The 

 theory of their operation is similar to that of bone and 

 horn shavings. 



The refuse of the different manufactures of skin 

 and leather form very useful manures ; such as the 



