222 Transactions of the Royal Microscopical Society. 



after which, by replacing the glass D in its cavity a', h', c, d', and 

 gumming on a new frame of thin paper, the slide is renewed, by 

 this really simple, though apparently complex method. 



The pieces of cardboard and wood, as well as the little frames 

 of thin paper, can be obtained ready made, and already gummed as 

 far as necessary, so that numbers may be put together in a little 

 time. 



