714 



RECORD OF CURRENT RESEARCHES RELATING TO 



rather complicated and if used daily for several Lours would be likely 

 to want rci)airing," and another, that it cannot be used as an ordinary 

 Microscope. 



In the new form, shown in Fig. 62, the slide is composed of two 



Fig. G2. 



circular glass plates, 5 mm. thick and 8 cm. in diameter, which are 

 pressed firmly together by a metal knob at their centre. They thus 

 form a compressorium at the same time. The under plate, which may 

 of course be thickly covered with the preparations, is divided into 

 four sections, which are numbered for identification. To prevent any 



