Proceedings of Seventeenth Xormal Institute 273 



realize. Rates of production of both crop tuid animal products 

 that will be profitable depend very much upon prices received. 

 Potato prices do not justify the same fertilizer practices in 

 Franklin county as on Long Island. Cheese factory prices for 

 milk do not justify the same feeding methods as do a wholesale 

 price of 4 cents per quart. Parmers are nearer correct in respect 

 to production rates than many agricultural workers believe. 



LIMITS OF OPTIMUM SIZE, DIVERSITY AND PRODUCTION 



It is desired only to call your attention to the fact that with all 

 these factors there are upper limits as well as lower. The reasons 

 are made clear in the references cited at the beginning of this talk. 

 The limits vary in different sections, depending primarily on such 

 natural conditions as topography, climate and soil ; and second- 

 arily on market facilities, labor supply, etc. This point will be 

 illustrated by the farm records that follow. 



Average Number of Days Between the Last Frost in Spring and the First in Fall * 



From Cornell Bui. 316, Frosts in New York, by U. M. Wilson. 



