THE MICROSCOPE. 95 
$50.00 ; with the addition of objective No. 9, the price is 
$70.00. No better instrument for actual work can be bought. 
When we come to speak of the comparative merits of the 
instruments manufactured or extensively sold in America, 
it is a rather more delicate mattcr to decide between them, 
though no corresponding difficulty exists. Beyond all doubt 
the best stand for the student is the American Histological 
stand manufactured by J. Zentmayer, of Philadelphia, and 
with an 8; and a + objective is sold for $50.00. Those who 
prefer a rack and pinion can obtain from this maker essen- 
tially the same instrument with this addition ; the same stand 
for $58.00. Were the stages of these instruments an inch 
lower and an inch larger, as they could readily be made, they 
would be much more convenient. 
R. and J. Beck, of Philadelphia, make an excellent instru- 
ment, the ‘‘ Economic’ (No. 263), which with two objectives 
(1 in. and } in.) they sell for $40.00. The same with rack and 
pinion and two eye-pieces( No. 264) is advertised for $55.00. 
Bausch and Lomb, of Rochester, make the “ Physicians’”’ 
microscope, of fair workmanship, which with two eye-pieces 
and two objectives, 2? and } (No. 550), brings $60.00. Their 
instruments, however, would be much better did they avoid 
the use of rubber in their construction. 
The instruments and objectives of ‘Tolles, of Doston, possess 
no advantages at all commensurate with the greatly exorbitant 
prices charged for them. 
In case the student desires higher powers than those enum- 
erated with the foregoing instruments, it will be for his advan- 
