144 OUII.IMsMK I II LD-GEOLc PART II 



then \ ly pushed along to the contiguous 



slip of glass. Considerable- pra< tire is needed in this 

 part of the work, as tin- slu e, being so thin, is apt to go 

 to pieces in bcinu transferred. A gentle inclination of 

 ;nn plate is advantageous, so that a tendency may 

 be given to the slice to slip downwards of itself on to the 

 clean glass. We must never attempt to lift the slice. 

 All shiftings of its position should l>e performed with the 

 point of a long needle or other sharp instrument. If it 

 goes to pieces we may yet be able to pilot the fragments to 

 their resting-place on the balsam of the new glass, and the 

 resulting slide may be sufficient for the required purpose. 



When the slice has been safely conducted to the centre 

 of the glass slip, we put a little Canada balsam over it 

 and allow it to be warmed as before. Then taking with 

 the forceps one of the well-cleaned thin cover-glasses, we 

 allow it gradually to rest upon the slice by letting down 

 first one side, and then by degrees the whole. A few 

 gentle circular movements of the cover-glass with the 

 point of the needle or the forceps may be needed to 

 ensure the total disappearance of air- bubbles. When 

 these do not appear, and, when, as before, we find that 

 the balsam has acquired the proper degree of consistence, 

 the slide containing the slice is removed, and placed on 

 the table with a small lead weight above it in the same 

 way as already described. On becoming quite cold and 

 hard the superabundant balsam round the edge of the 

 cover-glass may be scraped off with a knife, and any 

 which still adheres to the glass may be removed with a 

 little spirits of wine. 



Small labels should be kept ready for affixing to the 



