70 DROSERA ROTUNDIFOLIA. Cxar. LY 
distinctly seen in a small mass of protoplasm in one of the cells 
of a tentacle.* After a few hours all the tentacles and the 
blade became inflected. 
Experiment 2.—Another leaf was plunged into water at 130° 
to 131°, and as before there was no inflection. After being kept 
in cold water for an hour, it was placed in the strong solutior 
of ammonia, and in the course of 55 m. the tentacles were con- 
siderably inflected. The glands, which before had been rendered 
of a brighter red, were now blackened. The protoplasm in the 
cells of the tentacles was distinctly aggregated ; but the spheres 
were much smaller than those usually generated in unheated 
leaves when subjected to carbonate of ammonia. After an 
additional 2 hrs. all the tentacles, excepting six or seven, were 
closely inflected. 
Experiment 3.—A similar experiment to the last, with exactly 
the same results. 
Experiment 4.—A fine leaf was placed in water at 100° (87°°7 
Cent.), which was then raised to 145° (62°°7 Cent.). Soon after 
immersion, there was, as might have been expected, strong 
inflection. The leaf was now removed and left in cold water; 
but from having been exposed to so high a temperature, it 
never re-expanded. 
Luperiment 5.—Leaf immersed at 130° (547-4 Cent.), and the 
water raised to 145° (62°°7 Cent.), there was no immediate in- 
flection; it was then placed in cold water, and after 1 hr. 20 m. 
some of the tentacles on one side became inflected. This 
leaf was now placed in the strong solution, and in 40 m. all 
the submarginal tentacles were well inflected, and the glands 
blackened. After an additional interval of 2 hrs. 45 m. all the 
tentacles, except eight or ten, were closely inflected, with their 
cells exhibiting a slight degree of aggregation; but the spheres 
of protoplasm were very small, and the cells of the exterior 
tentacles contained some pulpy or disintegratéd brownish 
matter. 
Experiments 6 and 7—Two leaves were plunged in water at 
135° (57° 2 Cent.) which was raised to 145° (62°-7 Cent.); neither 
became inflected. One of these, however, after having been left 
for 31 m. in cold water, exhibited some slight inflection, which 
increased after an additional interyal of 1 hr. 45 m., until 
* Sachs states (‘Traité de Bo- after they were exposed for 1 m. 
tanique,’ 1274, p. 855) that the in water to a temperature of 47° 
movements of the protoplasm in to 48° Cent., or 117° to 119° 
the hairs cf a Cucurbita ceased Fahr. 
