208 Albinism in Maize 



plants is somewhat different. Preparations were made of leaves of 

 different ages. Fig. 2 shows the cross. section of a leaf of a very 



Fig. 2. Cross section through a leaf of a .young yellowish-white 

 seedling at the stage illustrated in PI. VIII, fig. 3. The 

 plastids are small and are comparatively few iu number. 

 They were differentiated in the same manner as the plastids 

 of the guard cells of the stoma shown at " S." x 380. 



young seedling such as that shown in PI. VIII, fig. 3. Even though the 

 leaf was only yellowish, there was a differentiation of small granular 

 bodies resembling diminutive plastids. It will be noted that these 

 small bodies react to the stain in the same manner as do the plastids 

 shown in the guard cells of the stoma. The material illustrated in 

 Fig. 3 was taken from an older plant which was turning greenish. 



Fig. 3. Cross section through a leaf of an older yellowish- 

 white plant, such as illustrated in PI. VIII. fig. 4a. The 

 plastids have increased in size and number, x 360. 



