86 Mr. J. Blackwall on new Species of East-Indian Spiders. 
When we see all these various simple organizations engaged 
in rapid development and progressive growth at the expense of 
the fluid cell-contents, we are led to the supposition that, under 
such conditions, this cell-juice cannot be of exactly the same 
nature in the different regions of the cell, but that the fluid 
occupying the periphery of the cell-cavity, and secreted by the 
assimilative cell-membranes, will be physically and chemically 
different from that surrounding the vesicles which assimilate the 
nitrogenous compounds, and, again, that it will be differently 
constituted in the vicinity of those which appropriate compounds 
rich in carbon. 
It is only by this supposition that a movement of the cell- 
juice appears to be explicable. This is the movement which was 
discovered by Corti in 1774, and which we must still regard as 
wonderful so long as we do not recognize the true nature of the 
cell-contents, but believe that the cell-juice separates into a 
denser and a thinner portion, that the latter is diffused through 
the former in the shape of drops, and that the denser muci- 
laginous fluid circulates between the watery drops without 
mixing with them! This would be to transfer to the cell 
Grew’s notion of the structure of the tissue of plants, which, 
after the lapse of 200 years, has fortunately been overthrown. 
There is, however, no doubt that the mucoid filaments by 
which the nucleus appears to be suspended are the fluid and 
frequently granularly mucilaginous contents of the tissue-cell, 
moving gently among colourless, non-nucleated cells. The form 
of these filaments is therefore equally variable with that of the 
cells themselves. With the increasing enlargement of the two 
daughter cells produced in the cell-nucleus, or of the two large 
colourless secretion-cells from the ends of the cell towards its 
middle point, this system of filaments changes continually, and 
thus indicates the changes which are taking place in the other- 
wise recognizable cells of which they occupy the interspaces. 
[To be continued. | 
1V.—Descriptions of Seven new Species of East-Indian Spiders 
received from the Rey. O. P. Cambridge. By Joun Buack- 
waLL, F.L.S. 
Tribe Octonoculina. 
Family Lycosipa&. 
Genus Spuasus, Walck. 
Sphasus lepidus. 
Length of the female 4rd of an inch; length of the cephalo- 
