ry 
QUARTERLY CHRONICLE. 47 
and the other to the vegetable, side of the imaginary (?) line 
which divides the two great kingdoms of organized beings.” 
In fact, the deductions as to the animal nature of the Péi- 
dinens which Professor Clark seeks to draw from his re- 
searches do not apply to these beings, since the Infusorian 
he examined was not a Peridinium, but a Urocentrum. This 
does not, however, detract from the value of Professor Clark’s 
observations. 
Miscellaneous—An ingenious device for a growing slide is 
given in ‘ Silliman’s American Journal of Science’ for Sep- 
tember, 1865, by H. L. Smith, of Kenyon College, U.S. 
The “slide” consists of a rectangular glass cell 3 x 2 inches, 
and about th inch deep. A small hole is drilled in the 
cover, which is closely fitted and cemented to the cell, ex- 
cepting at one corner, which is cut away so as to allow the 
introduction of water into the cell by a pipette. The living 
object which it is desired to keep supplied by fresh water is 
placed near the small hole drilled in the cover, and it and 
the hole are both covered by a piece of thin glass. As the 
water in which the object is placed dries, more is absorbed 
by capillary attraction from the cell through the small hole. 
The cell will need replenishing (through the larger hole left 
by the cutting away of the corner of its cover) but once in 
three days. ‘This simple little appliance seems to be a very 
valuable addition to microscopical apparatus. 
