fife. = Extra-fascicular cambium, or subcortical mcristem, 

 pm. - ParenchymatouB matrix of zone of secondary thick- 

 ening. 

 sh. = Soft bast of secondary bundle. 

 ifc. — Trace of intra-fascicular cambium ? 

 dd. = Dotted ducts of xylem portion of secondary bundle. 

 tv. = Wood-cells. 

 Fig. 3. Eeticulated imperforate septum from the duct marked x 

 in Plate Ill.(a), fig. 1; magnified 720 diameters. 



Testudinaria elejjhantipes. 



Fig. 4. Longitudinal section of portion of stem, magnified 79 

 diameters, showing portion of one of the large ducts with very 

 oblique and much elongated imj^erforate septum, which is marked 

 with transversely elongated pits in its middle portion, and finely 

 dotted towards the narrowed extremities. The drawing from which 

 this figure is a photo-lithographic reduction was made with assistance 

 of camera lucida under high power (of course from a number of fields 

 of view), and measures about thirty inches. 



d. =■ Duct, the wall of which is surrounded by com- 

 paratively short parenchyma cells with dotted 

 markings. 

 s. = Oblique sej)tum across the duct. In this specimen 

 the septum is one- tenth of an inch in length. 

 ■pnt. = General parenchymatous matrix, consisting of finely 

 dotted cells considerably larger than those im- 

 mediately surrounding the duct. 



