PLATE 50 
1. —Cross section of a normal cauliflower leaf. A , Lower surface; B, tipper sur¬ 
face. Seven stomata are visible. In the center are two small vascular bundles, one 
cut longitudinally, the other crosswise. Section stained with methyl green and 
acid fuchsin. X 210. 
2. —Early stage (third day) of cauliflower intumescence due to vapor of ammonia. 
The lower epidermis still covers the growing tumor and five stomata are visible in it 
(at XX). Same magnification and same leaf as in figure 1. Tumor formed out of 
the loose parenchyma. Particular attention is called to the increased size of the 
cells and the reduction of intercellular spaces in the intumescence, also to changes 
in the palisade tissue. 
