6 DROSERA ROTUNDIFOLIA. [Cuar. I. 
immersion in alcohol deposits much brown matter. I presume that 
they are actually connected with the spiral vessels which run up the 
tentacles, for on several occasions the latter were seen to divide into 
two or three excessively thin branches, which could be traced close up 
to the spiriferous cells. Their development has been described by Dr. 
Warming. Cells of the same kind have been observed in other plants, 
Fic. 3. 
(Drosera rotundifolia.) 
Longitudinal section of a gland; greatly magnified. From Dr. Warming. 
as I hear from Dr. Hooker, and were seen by me in the margins of the 
leaves of Pinguicula, Whatever their function may be, they are not 
necessary for the secretion of the digestive fluid, or for absorption, or 
for the communication of a motor impulse to other parts of the leaf, as 
we may infer from the structure of the glands in some other genera of 
the Droseracezx. 
