54 DROSERA ROTUNDIFOLIA. Guar. IIT. 
could be seen filled with purple fluid, without a vestige of 
aggregated protoplasm; the whole having been redissolved. A 
leaf with aggregated masses, caused by its having been waved 
for 2 m. in water at the temperature of 125° Fahr., was’ left in 
cold water, and after 11 hrs. the protoplasm showed traces 
of incipient redissolution. When again examined three days 
after its immersion in the warm water, there was a conspicuous 
difference, though the protoplasm was still somewhat aggre- 
gated. Another leaf, with the contents of all the cells strongly 
aggregated from the action of a weak solution of phosphate of 
ammonia, was left for between three and four days in a mixture 
(known to be innocuous) of one drachm of alcohol to eight 
drachins of water, and when re-examined every trace of agere- 
gation had disappeared, the cells being now filled with homo- 
geneous fluid. 
We have seen that leaves immersed for some hours in dense 
solutions of sugar, gum, and starch, have the contents of their 
cells greatly aggregated, and are rendered more or less flaccid, 
with the tentacles irregularly contorted. These leaves, after 
being left for four days in distilled water, became less flaccid, 
with their tentacles partially re-expanded, and the agegre- 
gated masses of protoplasm were partially redissolved. A leaf 
with its tentacles closely clasped over a fly, and with the con- 
tents of the cells strongly aggregated, was placed in a little 
sherry wine; after 2 hrs. several of the tentacles had re- 
expanded, and the others could by a mere touch be pushed back 
into their properly expanded positions, and now all traces of 
aggregation had disappeared, the cells being filled with perfectly 
homogeneous pink fluid. Tho redissolution in these cases may, 
I presume, be attributed to endosmose. 
On the Proximate Causes of the Process of Aggregation. 
As most of the stimulants which cause the inflection 
of the tentacles likewise induce aggregation in the 
contents of their cells, this latter process might be 
thought to be the direct result of inflection; but this 
is not the case. If leaves are placed in rather strong 
solutions of carbonate of ammonia, for instance of 
three or four, and even sometimes of only two grains 
to the ounce of water (i.e. one part to 109, or 146, or 
