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 matter 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 T 8 7 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 

 ( i 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, f 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 Boston, 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- 



