68 



THE MICROSCOPE. 



by pressing the two projecting studs ; to the opposite end of the wire 

 is adapted a small brass-cup, filled with cork, into which pins, passed 

 through discs of cork, card-board, or other material, having objects 

 mounted on them, may be stuck. 



Dipping-tubes for taking up Animalcules. These are tubes of glass, 

 fig. 46, about nine inches in length, open at both ends, and from one- 



fig. 46. 



fig. 47. 



eighth to one-fourth of an inch in diameter. The ends should be nicely 

 rounded off in the flame of a blow-pipe ; some of them may be straight, 

 whilst others should be drawn out to a fine point, and made of either 

 of the shapes represented at cde. Mr. Varley describes the method of 

 using them in volume forty-eighth of the Transactions of the Society of 

 Arts. Supposing the animalcules that are about to be examined to be 

 contained in a phial or glass jar, as in fig. 47, having observed where 

 they are most numerous, either with the naked eye, if they are large, 

 or with a pocket-magnifier, if they are small, either of the glass-tubes, 

 having one end previously closed by the thumb or fore-finger, wetted 

 for the purpose, is introduced into the phial in the manner represented 



