3io 



PRACTICAL MICROSCOPY. 



may be observed that the labels upon the slides are readily 

 seen without the trouble of taking out each tray. 



In special methods of microscopical research there will be 

 wanting many fine and delicate pieces of apparatus, which 

 ofttimes will have to be made and devised by the student 

 himself. This is excellent practice, and he should learn to 

 exercise his ingenuity to the utmost, and not be running to 

 the optician constantly for every trifling little thing he 

 requires. An instance of how apparatus may be improvised 

 is shown by Fig. 256, which is a breeding cage for Podura, 



FIG. 256. 



devised and illustrated in the ' Monthly Microscopical 

 Journal ' by Mr. Mclntire. The glass plate, perforated with 

 a hole, is covered on each side with a thinner glass, and 

 held in position by two indiarubber bands. This is very 

 useful when the scales of these insects are required, and it 

 may also be brought into use as a flea cage, and for many 

 other purposes. 



FIG. 257. 



In concluding this chapter a few words may be said upon 

 sending slides by post. Pack them in a small wooden box 



