GO 



THIRD-CLASS MICROSCOrES. 



the other hand, may be recommended to those who think it well to 

 provide themselves in the first instance with a Microscope that is 

 capable of being improved by progressive additions. It is con- 

 structed (Fig 32) on the Lister model, and is not only very light 



Fig. 32. 



Crouch's Educational Microscope. 



and portable, but very free from tremor. The rack -movement is 

 so good that an Objective of l-4th inch may be focussed by it with 

 great exactness ; additional facility in this adjustment being given 

 (as in Mr. Ladd's Microscope, Fig. 36) by the use of a Lever- 





