PLATE 60 
Vertical sections from fixed and stained portions of catdiflower intumescences shown 
on Plate 56 and in cross section on Plates 58 and 59. Time, 7 days. Upper surface of 
leaf at top. 
1. —Middle vascular bundles giving off incipient vessels to the tumor. The epi¬ 
dermis is dead at X, and a cork layer has formed under it. X 160. 
2. —Sieve tubes and incipient xylem vessels developing. Here again the epidermis 
covering the top of the hyperplasia is dead, and cork has formed. X 160. 
3. —Section through the middle of an intumescence which received a minimum of 
stimulation and in which only the epidermis and two layers of cells immediately under 
it have responded. Time, 7 days. Many such abortive tumors can be seen on the 
surface of the photograph from which Plate 56 was made and some of them also in 
the half-tone. X160. 
