142 THE Microscope. 
which will easily be done when it is well stocked with these 
animalcules: the continual motion of them preventing any 
mouldiness thereon. 
A water-glass, or some other glass vessel, is the most 
convenient to keep your paste in; for by holding it up against 
the light, you’ll oftentimes perceive the ee/s wriggling them- 
selves above the surface of the paste upon the sides of the 
glass, and may be able to take several of them with a pen 
or hair pencil, much more disengaged from the paste, and 
consequently fitter for view, than if you are obliged to 
examine the paste itself in order to find them in it. 
Apply them to your microscope upon a single tale or 
isinglass, after having first put on it a very small spot of water 
for them to swim about in. The thicker your paste is, and the 
more they are enveloped in it, the greater proportion of water 
will be requisite to dilute it, that they may disentangle them- 
selves, and be rendered distinctly visible. 
They are very entertaining objects, examined by any kind 
of a microscope, but particularly the solar one, by which I 
have magnified them sometimes to an inch and a half, or two 
inches in diameter, with a length proportionable, and have 
found them answer exactly the appearance of such sized eels. 
The internal motion of their bowels may very plainly be 
distinguished, and when the water is dryed almost away, and 
they are near expiring, their mouths may be seen opening to 
a considerable width From Henry Baker, written in 1748. 
—__—<  >—___—__ 
A New Microscore Stipe.—Those who delight in looking 
at the coursing of the blood through the web of a frog’s foot, or 
the motion of the sap as seen in Vallisneria, will be pleased with 
the spectacle of the flow of oil towards the flame of a burning lamp. 
To see this interesting phenomenon it is only necessary to raise 
the burner partly out of the lamp, then hold it steadily, close 
enough to the microscope, which ought to bo turned horizontally, 
and use alin. or lesser power objective, when the current of 
fluid will be observed writhing and struggling amongst and 
through the interstices of the cotton wick. The oil may be col- 
ored if thought desirable-—nglish Mechanic. 
