NO TREATMENT f SOIL TREATMENT 



FIG-. 13. These rabbits were uniform in size when small. They were fed les- 

 pedeza hay from five sections of Missouri. The hay came from paired fields 

 one fertilized, one not fertilized. The difference in animal growth from the 

 Elclon, Clarksville, and Iiintonia soils is startlingly apparent. There are also 

 differences in the other two cases which the scales, close examination, and dis- 

 section reveal. 



33 



