IOO ALBERT FRANCIS BLAKESLEE. 



PLATE II. 



FIGS. 18 AND 19. "Imperfect hybridizations" between Mucor V. (+) and 

 A. spinosa ( U ) drawn from living material. 



FIGS. 20-24. "Imperfect hybridizations" between Mucor V. ( ) and A. 

 spinosa ( S ). Fig. 20 drawn at 7.30 A.M. Fig. 21, the same at 3.30 P.M., 

 Sept. 12. Fig. 23 drawn P.M., Sept. 12. Fig. 24, the same, A.M., Sept. 13. 



