36 MICROSCOPIC POWERS 



optics used in the Universities that f the 

 theoretical limit of microscopical vision is the 

 TOWU^h f an inch' is hardly correct, inas- 

 much as 120,000 lines, or Jrd more, can 

 actually (not theoretically) be seen showing 

 up strongly with a Jth inch oil immersion, 

 which is by no means a very high-power 

 objective nowadays. 



Although the high amplification of 1,000 

 diameters is not an extensive limit to the 

 powers of the microscope, yet, beyond this, the 

 objectives must be higher than the T ^th inch, 

 and the eye-pieces of the highest power. 



Only a few, who may be looked upon as 

 specialists in microscopy, ever exceed this range 

 of magnification. 



Several of these illustrations are from nega- 

 tives of much higher amplification than 1,000 

 diameters, but in these cases the camera has 

 augmented the work of the microscope. 



