2-'.: 'PR^CTIC'A^L' AGRICULTURAL CHEMISTRY 



that a large number of the investigations on plants can 

 be often carried out only once a year, the existence of 

 many fermentative changes (malting, humification, 

 nitrification) which seem to lie on the border-line 

 between chemistry and biology, the important part that 

 seasonal and climatic changes play in the case of plants 

 and also of animals, complicate to a large extent the 

 precautions that have to be taken in interpreting 

 results, and often render the practical application of 

 laboratory experiments a matter of extreme difficulty. 

 But still it cannot be denied that chemistry has 

 proved of incalculable benefit to the scientific agri- 

 culturist, and without doubt will in the future play a 

 still more important part in the raising of agriculture 

 to the rank of an exact science. 



