22 



The Microscope. 



These remarks may sufficiently suggest the methods 

 by which the objects described in this book were got 

 together ; for it may be well to mention that I had 

 the pleasure of preparing nearly all of them, as well 

 as of drawing and describing them. I can therefore 

 add from experience a few hints about what is called 

 the " mounting " of microscopic objects, that is, of 

 making preparations on glass slides similar to those 

 supplied by opticians. Many things are fit to look at, 

 especially with the lower powers of the microscope. 



No. 3. Group of implements for the collector. 



by merely placing them on the stage, or holding 

 them in the forceps ; some should be put into the live- 

 box; but the glass slide is perhaps the plan most 

 frequently applicable, as a satisfactory way of pre- 

 serving the object, and because the thin glass cover 

 placed over it tends to produce flatness. 



I have already advised that you should examine 

 some slides supplied by an optician. If you do so, it 

 will soon strike you that all are not prepared in the 

 same mode. Some have on the centre a little raised 



