THE HERBAKIUM. 377 



vegetable tissues, will do equally well for them; and, as 

 most of them are not of so perishable a nature as forms of 

 a higher rank, any delay, from other engagements, in mount- 

 ing them, is not of material consequence. 



When mounted on glass slides, or other modes in which 

 they can be viewed by transmitted light, they form per- 

 manent objects, not only of scientific interest, but also, from 

 the beauty of their form, of agreeable entertainment to even 

 the uninitiated, and it is to several simple plans of preparing 

 them for this purpose that we devote the few following 

 paragraphs. 



In the first place, we must mention the few implements 

 and materials required in preparing the cells, and afterwards 

 mounting the objects in them. These are, slips of crown 

 or patent plate glass, rough or smoothed at the edge. The 

 size chiefly used is that approved by the Microscopical 

 Society, viz., three inches by one inch. In using a uniform 

 size, great facility is given in the way of exchange. 



Thin or microscopic glass, cut into circular or square 

 pieces of various sizes, as covers for the objects immersed 

 in fluid. 



Phials with a supply of either of the liquid preparations 

 enumerated below. 



