Tue Microscope. 
101 
( Max. .000,266,6' or 1-3,750 in. 
Cat. 200 meas. Min. .000,195,5’ or 1-5,114 in. 
Aver. .000, 299/9' or 1-4,469 in. 
Max. .000,266,7' or 1-3,750 in. 
Cat. 200 meas. ~ Min. .000,177,8' or 1-5.628 in. 
Aver. .000,217' or 1-4,591 in. 
Max. .000,248,8+’ or 1-4,018 in. 
Chipmuck. 200 meas. Min. .000,151' or 1-6,250 in. 
Aver. .000,217,1' or 1-4,607 in. 
Max. .000,231' or 1-4,327 in. 
Ox. 200 meas. < Min. .000,160' or 1-6,250 in. 
Aver. .000,199' or 1-5,008 in. 
Max. .000,213' or 1-4,687 in. 
Sheep. 200 meas. + Min. .000,160' or 1-6,250 in. 
Aver. .000,179' or 1-5,593 in. 
Max. .000,284' or 1-3,516 in. 
House Mouse. 200 meas. <~ Min. .000,160' or 1-6,250 in. 
Aver. .000,239' or 1-4,182 in. 
Max. .000,199,5' or 1-5,111 in. 
Common Goat. 200 meas. < Min. .000,142,2’ or 1-7,031 in. 
Aver, .000,165,5' or 1-6,042 in. 
CAM FINE ADJUSTMENT. 
BY EPHRAIM CUTTER, M. D., NEW YORK. 
OR years I have sought to simplify the mechanism of the 
compound microscope so that a really good instrument 
might be had for less money—not for the sake of doing away 
with the magnificent mechanisms now extant, but for paving 
the way for them by making microscopes as plenty and popular 
as pianos and organs. This contribution is one effort in this 
direction. 
Two ideas are involyed— 
1. To have a cam or cams at the distal end of stage which 
is a steel or brass plate fastened to the proximal end of bed 
plate of stage. 
2. To have four cams, one at each angle of the saiilt angu- 
lar stage, which is drawn down to the bed plate of stage by 
springs beneath, suggested by the late Dr. Louis Elsberg. 
The advantages of the cam fine adjustment for stage or 
tube of microscope are— 
1. Simplicity. 
2. Cheapness. 
3. Effectiveness. 
4, Less trouble from wear. 
