68 DROSERA ROTUNDIFOLIA. Cuar IV. 
when the leaves are subsequently placed in a solution of car- 
bonate of ammonia. But the most remarkable change is that 
the glands become opaque and uniformly white; and this may 
be attributed to the coagulation of their albuminous contents. 
My first and preliminary experiment consisted in putting 
seven leaves in the same vessel of water, and warming it slowly 
up to the temperzture of 110° Fahr. (48°3 Cent.); a leaf being 
taken out as soon as the temperature rose to 80° (26°6 Cent.), 
another at 85°, another at 90°, and so on. Each leaf, when taken 
out, was placed in water at the temperature of my room, and 
the tentacles of all soon became slightly, though irregularly, 
inflected. They were now removed from the cold water and 
kept in damp air, with bits of meat placed on their discs. 
The leaf which had been exposed to the temperature of 110° 
became in 15 m. greatly inflected; and in 2 hrs. every single 
tentacle closely embraced the meat. So it was, but after rather 
longer intervals, with the six other leaves. It appears, there- 
fore, that the warm bath had increased their sensitiveness 
when excited by meat. 
I next observed the degree of inflection which leaves under- 
went within stated periods, whilst still immersed in warm 
water, kept as nearly as possible at the same temperature; but 
I will here and elsewhere give only a few of the many trials 
made. <A leaf was left for 10 m. in water at 100° (87°7 Cent.), 
but no inflection occurred. A second leaf, however, treated in 
the same manner, had a few of its exterior tentacles very 
slightly inflected in 6 m., and several irregularly but not closely 
inflected in 10 m. A third leaf, kept in water at 105° to 106° 
(40°.5 to 41°1 Cent.), was very moderately inflected in 6 m. 
A fourth leaf, in water at 110° (48°3 Cent.), was somewhat in- 
flected in 4 m., and considerably so in from 6 m. to 7 m. 
Three leaves were placed in water which was heated rather 
quickly, and by the time the temperature rose to 115°—116° 
(461 to 46°06 Cent.), all three were inflected. I then removed 
the lamp, and in a few minutes every single tentacle was 
closely inflected. The protoplasm within the cells was not 
killed, for it was seen to be in distinct movement; and the 
leaves, having been left in cold water for 20 hrs., re-expanded. 
Another leaf was immersed in water at 100° (37°-7 Cent.), which 
was raised to 120° (48°8 Cent.); and all the tentacles, except 
the extreme marginal ones, soon became closely inflected. 
The leaf was now placed in cold water, and in 7 hrs 30m. it 
bad partly, and in 10 hrs. fully, re-expanded. On the follow 
ing morning it was immersed in a weak solution of carbonate of 
