Manchester Memoirs, Vol. xli. (1896), No. 1. 3 



not certain that the outermost layer is actually the 

 epidermis. For the most part the hairs are seen only in 

 transverse section. They are very rarely, and then for 

 short lengths only, presented in longitudinal section. As 

 in the epidermal cells, no cell contents have as yet been 

 met with in the hairs. 



Putting together the details observable in various 

 fragments, the hairs may be described as filaments made 

 up of a single row of cells placed end to end. At the 

 base, what appears to be a sort of pedestal is sometimes 

 seen, but no indications of anything of the nature of a 

 terminal gland have been found. From the fact that 

 transverse sections of the stem show the hairs, when 

 present, also cut, for the most part, transversely, it seems 

 probable that the latter were appressed rather than 

 spreading. 



The Cortex. 



The cortex is, apparently, cellular throughout, but 

 the outer part is usually more or less differentiated 

 from the inner. The former, or hypoderma, consists of 

 elements which in the transverse section are polygonal, 

 or rounded in shape, and of relatively large size. The 

 walls show some degree of thickening, which, however, 

 diminishes from without inwards. Longitudinal sections 

 show the elements to be much elongated in that direction, 

 and, in form and appearance, to be sclerenchymatous. 



The inner part of the cortex is composed of cells 

 which are somewhat smaller and rounder in transverse 

 section than the elements of the hypoderma. Towards 

 the stele they diminish in size, become somewhat com- 

 pressed radially (as was noted by Williamson),* and are 

 arranged in concentric layers. They show a certain 

 amount of wall thickening, which increases from with- 

 out inwards, and the innermost elements are elongated 



* Loc. cit. p. 350. 



