204 



MICROSCOPIC OBJECTS. 



one vertical, one horizontal, and one at an angle of 45°. 

 You will seldom want a greater variety of positions, or 



Fig. 4, 



make use of them, if you have a regular cradle-joint. 

 Well, then, fix the pin under the stage of fig. 4 into the 

 vertical hole, and you will have a flat table to place the 

 stage s, fig. 1 , upon, which you will then find will be 

 about the proper height ; if it is not, you can easily make 

 it so with a book or a piece of board : you had better 

 remove the frame and object-holder d, e, fig. 4, as it 

 will be in the way ; it will easily twist out of the hole 

 at k. 



In case, however, you should wish to observe with the 

 object-glasses under the stage, as in the case of viewing 

 crystallization of salts,* you must turn the body round 

 till the object-glasses are uppermost : and then a farther 



* Microscopic Illustrations, page 191. 



