342 



EVOLUTION AND GENETICS 



Fig. 192. — Results of crossing two inbred strains of corn. A, at the left are 

 two rows, each containing an inbred strain. The tall corn at the right is the 

 result of crossing them. B, the basket at the right represents the average 

 production of the two inbred strains after three generations of inbreeding — 

 sixty-one bushels per acre. The basket at the left shows the first generation 

 yield from the hybrid — one hundred and one bushels per acre. (From 

 Walter, after East and Hayes.) 



