8 DROSERA ROTUNDIFOLIA. Cuar L 
the cells of the pedicels are rendered of a bright red, with the 
exception of those close beneath the glands. These latter cells 
lose their pale red tint; and the green matter which they, as 
well as the basal cells, contain, becomes of a brighter green. 
The petioles bear many multicellular hairs, some of which 
near the blade are surmounted, according to Nitschke, by a 
few rounded cells, which appear to be rudimentary glands. 
Both surfaces of the leaf, the pedicels of the tentacles, espe- 
cially the lower sides of the outer ones, and the petioles, are 
studded with minute papillze (hairs or trichomes), having a 
conical basis, and bearing on their summits two, and occasion- 
ally three or even four, rounded cells, containing much proto- 
plasm. These papille are generally colourless, but sometimes 
include a little purple fluid. They vary in development, and 
graduate, as Nitschke* states, and as I repeatedly observed 
into the long multicellular hairs. ‘Lhe latter, as well as the 
papille, are probably rddiments of formerly existing tentacles. 
I may here add, in order not to recur to the papille, that they 
do not secrete, but are easily"permeated by various fluids: thus 
when living or dead leaves are immersed in a solution of one 
part of chloride of gold, or of nitrate of silver, to 437 of water, 
they are quickly blackened, and the discoloration soon spreads 
to the surrounding tissue. The long multicellular hairs are 
not so quickly affected. After a leaf had been left in a weak 
infusion of raw meat for 10 hours, the cells of the papillae had 
evidently absorbed animal matter, for instead of limpid fluid 
they now contained small aggregated masses of protoplasm, 
which slowly and incessantly changed their forms. A similar 
result followed from an immersion of only 15 minutes in a 
solution of one part of carbonate of ammonia to 218 of water, 
and the adjoining cells of the tentacles, on which the papilla 
were seated, now likewise contained aggregated masses of proto- 
plasm. We may therefore conclude that when a leaf has closely 
clasped a captured insect in the manner immediately to be 
described, the papillz, which project from the upper surface 
of the leaf and of the tentacles, probably absorb some of the 
animal matter dissolved in the secretion; but this cannot be 
the case with the papilla on the backs of the leaves or on the 
petioles. 
* Nitschke has elaborately described and figured the 
Bot. Zeitung,’ 1861, pp. 234, 253, 254. gu se papille, 
