CO 



< 



LU 



CD 



LU 



C£ 



LU 

 D_ 



in 

 < 



>- 

 o 



er 



NUMBER OF CORPORA LUTEA 



Fig. 10. Corpora lutea frequencies for two seasons superimposed (solid line, 1934-5 ! pecked line, 1935-6). 



5-2 



