302 Bibliography. 
position of the sponge-cell and its intercellular mucilage are for the 
| most part effected so imperceptibly, that they may be likened to those 
which take place inacloud. Its granules however are more active, 
but there appea otion in any part of the cell, excepting 
among the molecules within the hyaline vesicle, which in any way ap- ® 
proaches to that characteristic of the presence of cilia. 
‘It should be understood however, that these remarks are not appli- 
cable to every sponge-cell, although fully developed, which appears 1n 
it and remain stationarily attached to it. The changes in shape and 
the field of the microscope, but they are rather a statement of what a | 
77) 
° 
= 
oO 
. 
part of the cell to which they are attached is entrained in one direction 
_ “or another ;- while their hyaline vesicle or vesicles (in progression) ap- ~ 
: e cell, but ; 
sar occasionally in every part, not only of the body of the, 
anterior or 
fected 
; if complete, a dark ; 
pc ‘do ion, some of the large proteans developed in the way ; 
"+ just mentioned appear to be conscious of the nature of certain objects 3 
=*, which they in their cours d surround : 
as #, ay -Fuly 1 
_ * gutbody of a 
on ich 
a 
| 4 . . . fe . 
ass, When contraction takes place, it Is ellee : 
SP itien’| 
ish or-dead 0 : 
ing lengthened itself out so as to encit® 
rit from both sides, which uniting: 
nd int 
the proteal 
rround s 
