536 THE GROUNDSWELL. 



and vegetable life; should investigate the effects produced 

 upon soils by mechanical means, such as deep and shallow, 

 trench, and sub-soil plowing; should study the benefits of 

 thorough drainage and other methods of working the soil ; 

 should master the principles of a proper rotation of crops; 

 should store his mind with information relative to the appli 

 cation of special manures to certain crops, and the like 

 practical details, etc., etc. 



THE STUDY OF CHEMISTRY, PHYSIOLOGY, AND OTHER 

 SPECIALTIES. 



The agricultural student will also need some knowledge 

 of the chemical changes which soils undergo through various 

 agencies other than the disintegration of rocks ; as, for in 

 stance, the effects of a top-dressing of mulch or manure as 

 compared with a similar application that is plowed under, 

 and where one would be beneficial and the other hurtful ; and 



The Stock-breeder s Museum. 



the certain effects of fall and spring plowing on different 

 soils when and where to be practiced, andwhen not. As a, 

 stock breeder, he will need to acquaint himself with the 

 different breeds of horses, cattle, sheep, swine, etc.; the re 

 sults of their various crosses and grades ; their adaptability 

 to various uses and conditions ; their diseases and the proper 

 remedies therefor ; the proper methods of breeding, rearing, 



