232 CEMENTS AND VARNISHES 



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 and never runs in. It sets hard in a 

 few seconds. 



511. Apathy's Cement for Glycerin Mounts {Zeit. iviss. Mik., 

 vi, 1889, p. 171). Equal parts of hard (60° C. melting-point) 

 paraffin and Canada balsam. Heat together in a porcelain 

 capsule until the mass takes on a golden tint and no longer emits 

 vapours of turpentine. Used by warming and applying with a 

 glass rod or brass spatula. One application is enough. Does 

 not run in, and never cracks. 



512. Canada Balsam, or Damar. Cells are sometimes made with 

 these. They are elegant, but in my experience are not reliable for 

 permanent mounts. 



513. Tolu Balsam Cement (Carnoy's Biol. Cell., p. 129). Tolu 

 balsam, 2 parts, Canada balsam 1, saturated solution of shellac 

 in chloroform, 2 parts. Add enough chloroform to bring the 

 mixture to a syrupy consistence. Carnoy finds this cement 

 superior to all others. 



514. For the cements of Ward, Bell and Clarke and for 

 Kronig's Colophonium and Wax, Marine Glue, Amber and 

 Copal, and Sealing Wax Varnish, see last edition. 



