On a New Micro-telescope. 75 



Either of these objectives may be used as an erector, though the 

 higher ones will seldom be preferred for this purpose. The four or 

 five inch objective usually furnished with tank microscopes may 

 well be dispensed with, as its efiect is easily gained by means of the 

 erecting arrangement. Microscopists who have laid aside the ordi- 

 nary "erector" of the shops as an entirely unsatisfactory affair, 

 need not, on that account, expect a similar failure in the use of a 

 good one -inch or two-inch objective as an erector. 



The cost of this instrument ought not to be large. It should 

 not exceed sixty or seventy dollars to those already supplied with 

 objectives and compressors, or one hundred dollars complete. — 

 American Naturalist. 



VOL. TIT. 



