42 ELEMENTS OF APPLIED MICROSCOPY. 



ing the glass. A narrow, even ring may thus be. pro- 

 duced, and, by a gradual process of upbuilding, one of 

 considerable depth. If an object of greater thickness is 

 to be examined, a ring of brass or hard rubber may be 

 attached to the slide by a ring of cement similarly ap- 

 plied. 



When the cell has become so dry that there is no dan- 

 ger of the cement running, the object to be mounted may 

 be placed within it or attached to the under surface of a 



Fig. 24. — ^TuKNTABLE. (After Gage.) 



cover-sKp. The cover is then pressed gently down on 

 the ring of cement so that contact is complete all the 

 way round, and, after placing the slide on the tmrntable 

 once more, a fresh ring of cement is applied partly on 

 the edge of the cover and partly on .the slide. 



When thus prepared the dry mount is completed and 

 should be labelled on the left-hand end of the slide, the 

 nature of the specirnen, the treatment to which it has 

 been subjected, the mounting medium, and the date being 

 indicated. 



S. Mounting in Glycerin Media. — Glycerin mounts, 

 although not easy to make and less permanent than bal- 



