DESCRIPTION OF PLATES. 



I. A large hair of Phlomis Russeliana from the under epidermis. 

 Partly schematisch, a a are Pores. Enlarged about 160 times. 

 II. Hair and stomata from Helichrysum petiolatum. The end cell 

 c shows a lumen only for a short distance ; these cells are so 

 long and interwoven that it is not possible to separate them 

 to get the exact length. The stoma a is raised a little more 

 than the average. Enlarged about 330 times. 



III. From Salvia argentea. a shows a cell next the epidermis 

 and a part of the second cell ; b shows the end cell and the 

 manner of joining the next cell ; c the stoma. Enlarged 

 about 330 times. 



IV. Lower part of hair from Rubus Idaeus, also a stoma. En- 

 larged about 330 times. 



V. Alfredia cernua. The two kinds of hairs shown, a' is from 

 the lower part of a hair of the mid vein; a" shows the end 

 cell pressed together. Enlarged 160 times, b is the lower 

 part of a hair from the epidermis of the leaf surface, first 

 cell living and thin walled. Enlarged about 330 times. 

 VI. Lavatera oblongifolia, a a are stemless hairs, b has a short 

 stem. A shows a part of the upper epidermis with the bases 1 

 and 2 respectively of the long and short stemmed hairs. 



VII. Shows a cross-section through the leaf of Helichrysum to 

 show the filz and the comparative thickness of that of the 

 upper and under side of the leaf. 



VIII. Nerium Oleander, a is a cross-section through one of the 

 cavities containing the stomata, b is the cavity as seen from 

 above. 



