256 CEMENTS AND VARNISHES. 



oil of turpentine to the melted mass, and then to evaporate 

 for several hours over the water-bath. 



This cement is used for closing glycerin mounts; it is 

 applied in the following manner: Square covers are used, 

 and superfluous glycerin is cleaned away from the edges in 

 the usual way. 



The cement is then put on with a piece of wire bent at 

 right angles (No. 10 12 wire is taken, and copper is the 

 best, as it gives to the turpentine a greenish tinge) ; the short 

 arm of the wire should be just the length of the side of the 

 cover-glass. The wire is heated in a spirit lamp, plunged 

 into the cement, some of which adheres to it, and then 

 brought down flat upon the slide at the margin of the cover. 

 The turpentine distributes itself evenly along the side of the 

 cover, and hardens immediately, so that the slide may be 

 cleaned as soon as the four sides are finished. It is claimed 

 for this cement that it is perfectly secure, very handy, and 

 never runs in. Parker saw this cement, or a similar one 

 known as Venedischer Damarlack, exclusively used for gly- 

 cerin mounts in the Pathological Laboratory at Vienna. 



This is an extremely valuable method. It is very rapid and 

 very safe. The cement sets hard in a few seconds. 



445. Colophonium and Wax (KKONIG, Arch. f. mik. Anat. } 

 1886, p. 657 ; Journ. Roy. Mic. Soc., 1887, p. 344). Seven to 

 nine parts of colophonium are added piecemeal to two parts 

 of melted wax, the whole filtered and left to cool. For use, 

 the mass is melted by placing the containing vessel in hot 

 water. The cement is not attacked by water, glycerin, or 

 caustic potash. 



446. Amber Varnish. As above mentioned, BEHRENS finds 

 this cement to possess an extreme tenacity. He does not 

 give the composition of his varnish, which was procured from 

 B. Pfannenschmidt at Dantzic. The following is from COOLEY'S 

 Cyclopaedia, art. (t Varnish : " 



" Take of amber (clear and pale) 6 Ibs., fuse it ; add of hot 

 clarified linseed oil 2 gallons, boil it until it " strings" well, 

 then let it cool a little and add of oil of turpentine 4 gallons 

 or q. s." 



Other receipts, 1. c. 



