286 



ON POLTSTELIC EOOTS OF CERTAIN PALMS. 



Plate XX. 



Fig. 13. Drawing from a transverse section of the small stele [st.) indicated in fig. 6; the cells of the 

 endodermis are shown in their relation to the ueighbouring cells of the cortex and of the peri- 

 eycle; other features are indicated as in fig. 7. X 100 diam. 



(In the absence of an objective possessing simultaneously field and magnification sufficiently 

 great, this figure was obtained thus : a set of camera-lucida drawings was made under a 

 magnification of 294 diameters; these sections Avere then accurately fitted together; a tracing 

 was then made and the whole revised; that drawing has been reduced by the lithographer to a 

 magnification of 100 diameters.) 



Fig. 14. Diagram representing a transverse section of a thick root of Verschaffeltia ; many incomplete 

 and several complete steles are indicated; the complete stele {st.) is the one shown in fig. 15 ; 

 large vessels of the wood are indicated by small circles, x 2 diam. (The drawing was 

 checked by observations under a magnification of about 60 diameters.) 



Fig. 15. Diagram to illustrate the disposition of tissues forming the stele [st.) in fig. 14; scheme of 

 shading and lettering as in fig. 7. X25 diam. 



