32 



HEREDITY AS ILLUSTRATED BY TRICHOMES. 



Fig. 8 Trichomes of Juglans regia: a, awn-shaped trichomes ( ; 84): b to h, stages In the de- 

 velopment of disk-shaped trichornesj ( 535);/, abnormal disk-shaped trichome ( 1200); 

 j to'm, long secreting trichomes (./' and /, 1200; / and m 535): n to r, development of 

 short secreting trichomes, of which r is a transverse vieM- of </ (n, o, and p > 1200; q and 

 r X5.35); * to v, short secreting trichomes from rather old leaf ( 535); w, short secreting 

 trichomes from growing tip of stem ( 535). (All figures reduced one-fourth.) 



