120 
which, I may parenthetically observe, well deserves in itself 
a closer investigation, to which I may hope for an opportu- 
nity, should I refind it, to return on a future occasion,) and 
this organism seemed therein to form its principal food. 
Fig 2 represents a vigorous specimen, which has more than 
once afforded us instructive details in connexion with its 
behaviour, and which contains a specimen of the alga referred 
to, which it had incepted. Fig. 3 shows a small proto- 
coccoid which has been incepted. 
Having, then, thus tried in idea to build up the structure 
step by step, or to give such a descripture picture, as it were 
touch upon touch, of our form, as well as having made an 
endeavour in the figures by the aid of the brush, to realize its 
likeness, I trust I shall have succeeded in conveying to ob- 
servers a fair and available representation of this rhizopod, 
in some of the somewhat varied aspects of its living condi- 
tion. I must, however, devote a few words to a record of 
how far the behaviour of this rhizopod, under the action of 
certain reagents, bears out or explains the preceding account 
of its structure, and then speak of its seeming affinities, and 
assign it to its genus. 
On the application of Beale’s Carmine fluid, a collapse of 
the whole Rhizopod, coat and all, takes place; the green 
granules become more glassy in appearance; soon the whole, 
coat and all, begins to swell out again as globular as before ; 
no retraction of the sarcode body-mass from the coat seems 
to ensue, nor any dissolution of the hair-like external pro- 
cesses. The body-mass by-and-by becomes granular in 
appearance, and far less hyaline. But the most important 
effect produced by this valuable reagent, is the unfailing cer- 
tainty with which it brings to view the “ nucleus,” by reason 
of the extent to which this body absorbs the carmine colour, 
until by-and-by it assumes an intense red colour, far in excess 
of the pale rose tint presented by the remainder of the sar- 
code mass. The nucleus appears, as before, mostly slightly 
longer than broad, and sharply bounded. Sometimes a second 
rather sharp outline is apparent a little within the outer one ; 
the former of which, when present, bounds a space more 
highly coloured than the border beyond it. This, however, 
appears to be exceptional, and although in the living condi- 
tion the nucleus appears evenly granular, its substance now 
appears smooth and homogeneous. This experiment then 
is very satisfactory, as disclosing the presumably constant 
“nucleus,” but it does not seem to demonstrate the body- 
mass and its outer investing coat as independent. structures ; 
for, altered in appearance as may be the former, and though 
