PLATE SS 
Cauliflower leaf showing killing effect of vapor of mixed ethyl alcohol and acetic 
acid (Camoy’s fixing fluid—three-fourths absolute alcohol, one-fourth glacial acetic 
acid) on maturer leaves of the same plant as Plate 56. The stomata were open 
presumably in the particular areas which have been killed (the white parts) and 
not in the other parts. The local killing effect was visible immediately. No intu¬ 
mescences appeared on such leaves, not even around the margins of the white spots. 
The other parts of the leaf remained normal in color and function. Exposed oh Sep¬ 
tember 21, 1916. Photographed on September 28. XiK* 
