TOLLE'S STUDENT'S MICROSCOPE. 49 



object being sensibly displaced. Either form of stand 

 can be fitted with radial arm to carry accessory appar- 

 atus at any angle. Any thing that Mr. Tolles makes 

 is sure to be made well. 



TOLLES' STUDENT'S MICROSCOPE* 



This stand is fifteen inches high, weight six pounds; 

 the base, uprights, and curved arm are of iron, hand- 



somely japanned. On a trunnion joint, made on a plan 

 to wear well, the instrument can be placed in any posi- 

 tion, from vertical to horizontal, and has a stop to pre- 

 vent movement in either direction beyond these points. 

 The stage is plain, with spring-clips for holding the ob- 



