106 



CONSTRUCTION OF THE MICROSCOPE. 



Fig. 24. 



suitable position will generally be the horizontal, with its axis 



directed at right angles 

 to the flat side of the 

 Aquarium. It is obvi- 

 ous that the very same 

 instrument, turned from 

 the horizontal into the 

 vertical position, by at- 

 taching the clamp (as 

 in Fig. 24) to the edge 

 of a wooden strutt rising 

 vertically from a hori- 

 zontal slab, instead of 

 to the edge of a hori- 

 zontal table, becomes 

 extremely well suited 

 for examining objects 

 which are in course of 

 dissection in a trough 

 too large to be con- 

 veniently transferred to 

 the stage of the micro- 

 scope, for looking over 

 minute shells spread out 

 on a sheet of paper, and 

 for other purposes for 

 which a special form of 

 dissecting microscope 

 has been devised by 

 Messrs. Powell and Lea- 

 land. But again, by 

 turning up the J. shaped 

 support constructed for 

 the last-named pui-pose, 

 so that it shall rest (as it 

 were) on two legs like 

 the Greek ^, and then 

 clamping the stem that 

 carries the body to its 

 highest edge, the instru- 

 ment acquires a position 

 very suitable for ordi- 

 nary microscope work ; 

 and nothing is wanted 

 to adapt it to this, save 

 the addition of a stage 

 and a mirror, each of 



Warington's Universal Microscope, arranged for ordinary use. "^^'^■'^ may DC SO COn- 



structed as to fit into a 



WaruiL4ioiis Universal Microscope, as arranged for Dis- 

 section in a large trough. (N. B. — By drawing the stem a 

 through the clamp, the body may be shifted to such a dis- 

 tance fromlhe wooden base, that the latter need not interfere 

 with the dissecting trough.) 



Fig. 25. 



