66 
the plasma of the exterior half of the cells. Transverse sections 
allow accurate counting of the secretion rods in the outer part of 
the cell. As a rule their number is 12 to 15. Often they are 
arranged in transverse rows. Empty channels have actually been 
discerned, but they of course allow no safe counting and are, as 
a rule, rare. 
The fine rods of secretion are also stainable with eosin in 
hematoxylin-eosin preparations, with orange G and picrie acid, 
when used together with Fuchsin S, and with Safranin in combi- 
nation with Lichtgriin. On the use of oil immersion a granular 
arrangement in the rods is often visible. These rods of the adhe- 
sive cells but rarely pass beyond the level of the cell-body. This 
is a rather astonishing faet, but is perhaps attributable to pre- 
servation conditions. 
I have devoted mueh time to decide definitively the true nature 
of the projecting „hairs“ on the cell surface. They are several 
times coarser than the cilia of the supporting cells of the ordinary 
epidermis but their length is less than a fourth of that of the cilia. 
Absolutely contrary to the cilia, which are bent and twisted, having 
suffered in the fixation, they always have a straight course. In 
iron hematoxylin-Fuchsin S preparations they attain a strong tint 
of red. Counted on transverse section through the epidermis, their 
number is only slightly more than the number of secretion rods. 
I have tried in vain to definitively convince myself of the tubular 
nature of these „cilia“-like projections. The minuteness of these 
formations is a serious hindrance in obtaining full security in the 
interpretation. Empty rings are, however, never observed. On 
transverse sections of them a lustrous glaring core and a delicate 
„bark“ are traceable. When the rods of secretion are seen to 
pass beyond the cells, they just reach the outer level of these 
formations. It has, of course, not been possible to ascertain with 
full security an actual covering of the projecting secretion. But 
Fuchsin S or Lichtgriin produces an effeet, which makes it appear 
so. I have not been able to trace beyond doubts the direct continu- 
ation of the thick rods into the thinner processes ejecting from the 
surface of the cell, but it seems to me very probable. Owing to 
the delicateness of the structures, it is an extremely difficult test. 
A slight touch or a pressure on the tube of the microscope during 
