118 DROSERA ROTUNDIFOLIA. Cuap. VL 
Smaller bits were placed on two leaves; these were 
only slightly inflected in two days, but afterwards 
became much more so. Their secretion was not so 
strongly acid as that of leaves excited by casein. 
The bits of gluten, after lying for three days on the 
leaves, were more transparent than other bits left for 
the same time in water. After seven days both leaves 
re-expanded, but the gluten seemed hardly at all 
reduced in bulk. The glands which had been in 
contact with it were extremely black. Still smaller 
bits of half putrid gluten were now tried on two 
leaves; these were well inflected in 24 hrs., and 
thoroughly in four days, the glands in contact being 
much blackened. After five days one leaf began to 
re-expand, and after eight days both were fully re- 
expanded, some gluten being still left on their discs. 
Four little chips of dried gluten, just dipped in 
water, were next tried, and these acted rather dif- 
ferently from fresh gluten. One leaf was almost 
fully re-expanded in three days, and the other three 
leaves in four days. The chips were greatly softened, 
almost liquefied, but not nearly all dissolved. The 
glands which had been in contact with them, instead 
of being much blackened, were of a very pale colour, 
and many of them were evidently killed. 
In not one of these ten cases was the whole of the 
gluten dissolved, even when very small bits were 
given. I therefore asked Dr. Burdon Sanderson to 
try gluten in artificial digestive fluid of pepsin with 
hydrochloric acid; and this dissolved the whole. 
The gluten, however, was acted on much more slowly 
than fibrin; the proportion dissolved within four 
hours being as 40°83 of gluten to 100 of fibrin. 
Gluten was also tried in two other digestive fluids, 
in which hydrochloric acid was replaced by propionic 
