50 On Mounting. 



rates they will become completely permeated with it 

 and very transparent. If there are any folds these 

 should now be straightened out carefully with needles. 



Having placed a drop of Canada balsam on the slide, 

 spread it out slightly with a needle, select a section in 

 the oil of cloves, and pass the copper lifter under it, 

 raise the lifter and hold the section in position with a 

 needle by its upper corner, and having made sure there 

 are no folds, remove the lifter with the section on it 

 from the oil of cloves, let as much oil drain off as possi- 

 ble against the side of the vessel, and remove the rest 

 by placing the edge of the lifter on a piece of filter 

 paper. Place the edge of the lifter on the slide in the 

 drop of Canada balsam, and gently draw down the 

 section with a needle as soon as a corner projects from 

 the lifter on to the slide, hold it there lightly with the 

 needle and slowly draw away the lifter ; if this is care- 

 fully done the section will lie in its place in the middle 

 of the slide without any folds. 



A lifter is made by beating out the end of a copper 

 wire, filing it smooth, and then turning up the broad 

 portion slightly. 



Take up a cover glass with the broad pointed forceps 

 and hold it between the thumb and fore-finger of the 

 left hand, place a small drop of Canada balsam on its 

 lower edge, transfer to the right hand and gently lower 

 it on to the section, keeping the left thumb against one 

 corner to prevent its slipping, and gradually lower it by 

 removing the right hand very slowly, watching all the 

 time to see that no air bubble is entangled in the 

 section. 



