H. L, Smith on a Finger for the Microscope. 335 
With it, until the moisture is in focus; a slight touch of the 
finger now causes the hair to descend, and instantly the moisture 
takes the object off and causes it to lie flat on the glass. Of 
course the slide, having the objects thus placed upon it, must be 
handled gently; but there is no danger of disturbing or losing 
the objects if it is first gently breathed upon, but not obliquely 
unless with great care. The next step is to mount the objects, 
of which we will suppose there are several, say of Stauroneis 
acuta, in the center of the slide, without displacing them and 
altogether making but a slight white spot when viewed without 
a magnifier, or by a lens of one or two inches focus. Cut a small 
circular disc or square of thin glass of about a quarter of an 
lnch in diameter or breadth, and warming it gently, after cleans- 
To finish the slide, all that is necessary is to paste another 
label, with a small hole in its center, directly over the glass 
id 
