24. 



The Microscope. 



disfigure it. I employed gain, however, in preparing 

 several of my favourite slides, so small a quantity 

 being used that but little harm followed. Probably, 

 all preparers of microscopic objects have ways of 

 their own, and this was mine: The first thing to pre- 

 pare was the coloured paper cover ; and I invariably 

 use emerald green paper, that I may recognize my 

 own slides at a glance. Taking a sheet of this paper 

 (to be had at any fancy stationer's), I make, with a pair 

 of compasses, a number of those charming little concen- 



No. 4. Method of Mounting Objects. 



trie rings which are shown at No. 4, a. To cut up 

 the paper into little pieces like a, about an inch and a 

 half wide, and somewhat more than an inch high, and 

 to cut out the central circles, are pleasant and easy 

 tasks for spare moments. I generally make a great 

 number, and leave the centres purposely of various 

 sizes. When about to mount some objects and, as 

 must have been often observed in similar occupations, 

 it is almost as easy to mount ten specimens, when one 



