86 HOW TO SEE WITH THE MICROSCOPE. 



foot can be divided to degrees for the measurement of 

 angular aperture, my own stand is thus arranged. 



Besides those already mentioned other advantages 

 occur, from having the foot of the stand removable, 

 some of which may be enumerated as follows : 



First, by detaching the base, the instrument can 

 easily be carried in the pocket; it is also much easier to 

 pack, and occupies much less space in the packing. It 

 can thus be carried from place to place even in the nar- 

 row accommodations afforded by a small valise, the 

 bother of lugging about the usual microscope case 

 being no longer necessary. 



Second, Mr. Sidle provides at a small extra cost a 

 neat black walnut base board, furnished with small 

 lamp fitted with universal movements. This board has 

 also the necessary brass fittings to receive the pillar of 

 the microscope, which can be clamped to the board. 

 By this arrangement all that is necessary to convert the 

 instrument into a first-class hand microscope is to bring 

 the body to the horizontal position and to adjust the 

 object and the illumination. 



With the stand as thus arranged I have repeatedly 

 exhibited objects illustrative of my lectures to the col- 

 lege class of 150 students, the instrument being passed 

 from hand to hand throughout the entire class, and re- 

 turned to me everything remaining in perfect order. 



To teachers this feature of the stand will be of value. 

 It will also be found a great convenience at times when 

 the microscope is called on to furnish entertainment in 



