32 



HEREDITY AS ILLUSTRATED BY TRICHOMES. 



FIG. 8 Tricbomes of Juglans regia: a, awn-shaped trichomes (X 84): 6 to h, stages in the de- 

 velopment of disk-shaped trichomesj (>; 535); /, abnormal disk-shaped trichome ( X 1200); 

 ./ to^w, long secreting trichomes (./ and k X 1200; I and in \ 536): n to r, development of 

 short secreting trichomes, of which r is a transverse view of q (n, o, and p X 1200 ; q and 

 'X535); * to v, short secreting trichomes from rather old leaf (X 535); w, short secreting 

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



