S26 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
is dipped a Dumber of times in water contained in a wide-moutbed 
bottle. The operation is then repeated. The objects thus washed from 
the bag are retained in the bottle for examination. 
Fig. 80. 
Gathering microscopic objects. 
The common method of examining small objects of this kind is to 
place a drop of water containing some of the objects upon a glass slide 
by means of a drop-tube, then to apply a cover-glass, and remove the 
surplus water by the application of a piece of blotting-paper. This 
answers very well for the smaller objects, but the larger ones must be 
examined in a tank like that shown in fig. 90. This tank consists 
Fig. 90. 
Tank for microscopic objects. 
of a glass slide, to which are attached three glass slips, by means ot 
cement (bicycle-tire cement answers well for this purpose), the strips 
forming the bottom and ends of the tank. The front of the tank is 
formed of a piece of a glass slip attached to the strips by means of 
cement. To vary the thickness of the body of water contained in the 
tank when necessary, one or more glass slips are inserted behind the 
object.” 
