96 INTENSIVE FARMING 



profitable animals the whole enterprise is de- 

 feated. The remedy in this case is found in 

 the readjustment of one factor the stock. 

 This can be accomplished gradually by build- 

 ing up the herd or by the sale of the undesirable 

 individuals and the purchase of satisfactory 

 ones. 



If the aggregate is based on a cash return 

 from some vegetable crop, such as potatoes, 

 the profits can usually be greatly increased by a 

 proper rotation and good cultivation, but fre- 

 quently most of all by attention to the selection 

 and development of highly productive and de- 

 sirable types. A little hill selection work will 

 suffice to convince one of the value of improved 

 stock. A casual inspection of the product of 

 a series of hills of potatoes carefully dug so as 

 to keep the product of each hill separate will at 

 once bring out the fact that in some hills there 

 are only two or three tubers, in others one 

 large and three or four small tubers, in others 

 three or four large and three or four small 

 tubers, and still others four or five large an3 

 but few small tubers. 



If all types of hills are present in about equal 

 numbers the yield of the field is a mean be- 

 tween the high and low yielding hills. If the 

 low yielding hills are more abundant their pres- 





