Cuar. VI] DIGESTION. 85 
Experiment 1.—Two particles, barely 35 of an inch (1°27 mm.) 
square, were placed on opposite sides of the same leaf. One of these 
did not excite the surrounding tentacles, and the gland on which it 
rested soon dried. The other particle caused a few of the short adjoin- 
ing tentacles to be inflected, the more distant ones not being affected. 
After 24 hrs. both were almost, and after 72 hrs. completely, dis- 
solved. 
Experiment 2.—The same experiment with the same result, only 
one of the two bits of fibrin exciting the short surrounding tentacles. 
This bit was so slowly acted on that after a day I pushed it on to some 
fresh glands. In three days from the time when it was first placed on 
the leaf it was completely dissolved. 
Experiment 3.—Bits of fibrin of about the same size as before were 
placed on the discs of two leaves; these caused very little inflection in 
23 hrs., but after 48 hrs. both were well clasped by the surrounding 
short tentacles, and after an additional 24 hrs. were completely dis- 
solved. On the disc of one of these leaves much clear acid fluid was 
left. 
Experiment 4.—Similar bits of fibrin were placed on the discs of 
two leaves; as after 2 hrs. the glands seemed rather dry, they were 
freely moistened with saliva; this soon caused strong inflection both 
of the tentacles and blades, with copious secretion from the glands. 
In 18 hrs. the fibrin was completely liquefied, but undigested atoms 
still floated in the liquid; these, however, disappeared in under two 
additional days. 
From these experiments it is clear that the secretion 
completely dissolves pure fibrin. ‘lhe rate of dissolution 
is rather slow; but this depends merely on this substance 
not exciting the leaves sufficiently, so that only the 
immediately adjoining tentacles are inflected, and the 
supply of secretion is small. 
Syntonin.—This substance, extracted from muscle, was 
kindly prepared for me by Dr. Moore.* Very differently 
from fibrin, it acts quickly and energetically. Small portions 
placed on the discs of three leaves caused their tentacles and 
blades to be strongly inflected within 8 hrs.; but no further 
observations were made. It is probably due to the presence 
of this substance that raw meat is too powerful a stimulant, 
often injuring or even killing the leaves. 
Areolar Tissue-—Small portions of this tissue from a sheep 
were placed on the discs of three leaves; these became 
* [These results cannot be considered trustworthy; it appears that the 
syntonin prepared by the late Dr. Moore was far from pure.—F. D. 
