348 GLANDULAR HAIRS, Cuar. XV 
difference from the glands of other hairs. Perhaps there may 
not have been time enough for absorption. I think so as some 
glands, on which dead flies had evidently long lain, were of a 
pale dirty purple colour or even almost colourless, and the 
granular matter within them presented an unusual and some- 
what peculiar appearance. That these glands had absorbed 
animal matter from the flies, probably by exosmose into the 
viscid secretion, we may infer, not only from their changed 
colour, but because, when placed in a solution of carbonate of: 
ammonia, some of the cells in their pedicels become filled with 
granular matter; whereas the cells of other hairs, which had 
not caught flies, after being treated with the same solution for 
the same length of time, contained only a small quantity 
of granular matter. But more evidence is necessary before we 
fully admit that the glands of this saxifrage can absorb, even 
with ample time allowed, animal matter from the minute 
insects which they occasionally and accidentally capture. 
Saxifraga rotundifolia (?)—The hairs on the flower-stems of 
this species are longer than those just described, and bear pale 
brown glands. Many were examined, and the cells of the 
pedicels were quite transparent. A bent stem was immersed 
for 30 m. in a solution of one part of carbonate of ammonia to 
109 of water, and two or three of the uppermost cells in the 
pedicels now contained granular or aggregated matter; the 
glands having become of a bright yellowish-green. The glands 
of this species therefore absorb the carbonate much more 
quickly than do those of Sawifraga umbrosa, and the upper 
cells of the “pedicels are likewise affected much more quickly. 
Pieces of the stem were cut off and immersed in the same 
solution; and now the process of aggregation travelled up the 
hairs in a reversed direction; the cells close to the cut sur- 
faces being first affected. 
Primula sinensis.—The flower-stems, the upper and lower sur- 
faces of the leaves and their footstalks, are all clothed with a 
multitude of longer and shorter hairs. The pedicels of the 
longer hairs are divided by transverse partitions into eight or 
nine cells. The enlarged terminal cell is globular, forming a 
gland which secretes a variable amount of thick, slightly viscid, 
not acid, brownish-yellow matter. 
A piece of a young flower-stem was first immersed in distilled 
water for 2 hrs. 30 m., and the glandular hairs were not at all 
affected. Another piece, bearing twenty-five short and nine 
long hairs, was carefully examined. The glands of the latter 
spntained no solid or semi-solid matter; and those of only two 
