CARBONATE OF AMMONIA ON CHLOROPHYLL-BODIES. 283 
At this same time two adjoining cells included four and five oval 
or spherical chlorophyll-balls; but one cell still retained a spiral 
band. Alcohol and acetic acid produced only the same clarifying 
effect on these masses as in the case of ordinary chlorophyll- 
grains. 
Filaments of this alga were left for 26 hours in a solution of 
only 1 part of the carbonate to 1000 of water; but this sufficed 
to cause some granular deposition in the cell-sap, and many of 
the cells included, instead of the spiral band, spherical or oval 
or pear-shaped masses (and in one instance a half-moon-shaped 
mass) connected together by the finest threads of green matter, 
one of which was seen to break, and the pear-shaped mass quickly 
became almost spherical. The changes of form and the move- 
ments of the chlorophyll-band in the foregoing several cases, 
under the influence of the ammonia solution, closely resemble 
in most respects those which may be seen within the tentacles 
of Drosera. The above weak solution seemed to be favourable 
to the health of the plants; for after six days' immersion they 
looked greener and more vigorous than other plants of the same 
lot which had been kept in plain water. The cell-sap still con- 
tained brownish granular matter, and many of the cells oval or 
spherical masses. 
The brownish granular matter is always precipitated quickly ; 
and when three young cells, which were as transparent as glass, 
were irrigated with a solution of 7 to 1000, the precipitation 
seemed to be instantaneous. After a time the granules are 
either deposited on the protoplasm lining the walls of the cells, 
or they collect into one or two spherical masses in the middle of 
the cell. These spheres apparently consist of a delicate mem- 
brane lined with granules and enclosing cell-sap. They distinctly 
lay within the spiral band of chlorophyll Their appearance 
reminded me of the bag-like masses sometimes produced within 
the cells of dark-red leaves of Drosera when acted on by ammonia. 
In one instance the granules became collected into a spiral band. 
They were not acted on by alcohol, sulphurie ether, acetic acid, 
or a solution of iodine. Alcohol caused the protoplasm lining 
the walls to contract, by which means the granular matter and 
chlorophyll-bodies were all carried towards the centre of the 
cell. 
Three other kinds of Conferva were immersed in a solution of 
the carbonate, and were casually observed. In the first, in which 
