As such we submit it to the thoughtful reader. 



The book is not written for the instruction of the scien- 

 tist, nor is it intended as an exhaustive discussion of the sub- 

 ject, but to place in the hands of the practical farmer such 

 information, both scientific and practical, as he needs on the 

 subject under consideration. We have therefore, wherever 

 possible, translated scientific terms into every-day English 

 and have aimed to put the fodder in the rack where even the 

 lambs can reach it. Such has been the aim; how far we have 

 succeeded the reader must be the judge. 



HENRY WALLACE. 



