102 DROSERA ROTUNDIFOLIA. Cuar. VI. 
secretion from the glands. In 18 hrs. the fibrin was com- 
pletely 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 secre- 
tion completely dissolves pure fibrin. The 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 energetic- 
ally. 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 stimu- 
lant, often injuring or even killing the leaves. 
Aréolar Tissue—Small portions of this tissue from a 
sheep were placed on the discs of three leaves; these 
became moderately well inflected in 24 hrs., but began 
to re-expand after 48 hrs., and were fully re-expanded 
in 72 hrs., always reckoning from the time when the 
bits were first given. This substance, therefore, like 
fibrin, excites the leaves for only a short time. The 
residue left on the leaves, after they were fully re- 
expanded, was examined under a high power and 
found much altered, but, owing to the presence of a 
quantity of elastic tissue, which is never acted on, 
could hardly be said to be in a liquefied condition. 
Some areolar tissue free from elastic tissue was next 
procured from the visceral cavity of a toad, and 
moderately sized, as well as very small, bits were 
placed on five leaves. After 24 hrs. two of the bits 
