THE MICROSCOPE. 183 



allowing the starch to settle after each, pour off all the water, and in 

 its place add equal parts of glycerine and distilled water, with a lit- 

 tle, very little, of aniline blue. Now we have an object ready for 

 mounting, which will amply repay any labor or patience we may 

 bestow upon that operation. 



A good sized cell for this specimen is one that can be covered 

 with a ^ in. circle. We therefore place a cleansed slip of glass in 

 the jaws of the self-centering turn-table, and with the zinc cement 

 run a ring upon its surface about ^ of an inch wide and a little 

 over Yz in. outside diameter. The circles traced about the centre of 

 the table, which are visible through the glass placed upon it, are 

 ready guides in doing this. Two or three layers of the cement are 

 to be placed one over the other, and the slip must then be laid aside 

 to harden, for at least forty-eight hours before using. I find I have 

 gotten the cart before the horse in preparing my specimen before 

 the cells were ready, but fortunately the former will keep, and my 

 kind reader will pardon the oversight, and will suppose we commenced 

 the other way. 



The cement being thoroughly dry and hard, the slip is to be again 

 placed on the turn-table and a fresh coat applied, taking care not to 

 let it extend quite to the inner edge of the cell. Then from one of 

 our capillary bottles, containing equal parts of glycerine and dis- 

 tilled water, sufficient must be expelled to fill the cell 

 full to its inner edges, and rise up in the form of a 

 convex lens above its centre. The application of the 

 warm hand to one of these bottles is sufficient to drive 

 out any amount of its contents that maybe desired; but 

 the most useful appliance for the purpose is a small 

 vial with a hollow glass stopper, terminating in a 

 minute tube at its bottom, and a round ball or 

 bulb at its top, in the centre of which is a 

 small opening. When the vial is filled with any 

 fluid, and the stopper replaced, the fluid rises 

 Capillary Bouie. withiu it to the Same level as that in the vial. When 

 the stopper is removed, with the forefinger placed upon the 

 opening, it of course carries its contents with it, and any desired 

 portion of these may be carefully deposited within the confines of 

 our cell by raising the finger cautiously and allowing the air to en- 

 ter the bulb. A half dozen of these dropping bottles, placed in as 



