H. L. Smith on a Finger for the Microscope. 333 
one & screwed on to it below. This tube can be turned around 
as shown near A, 2 
A milled-head (/) 
receives the finger 
when it is desired 
carries the small spring forceps Pp, which turns freely in the 
socket r. The forceps grasp the triangular slip of card ¢, which 
has a bit of human hair u, gummed to it, and projecting about 
h. 
The slips of paper and the size and length of the hair may 
be varied to suit the different objects which are to be picked up. 
put in the forceps p, 
cut, but not too much; t 
and, by means of ‘the milled he 3 
hair turned one side. For my own u 
a 
e black dot. Next, bring 
turn back the 
