258 CEMENTS AND VARNISHES. 



452. Ziegler's White Cement. Composition unknown. Is 

 very much used on the Continent. 



453. Kitten's White-lead Cement (Month. Mic. Journ., 1876, 

 p. 221). Equal parts of white-lead, red-lead, and litharge 

 (all in powder), ground together with a little turpentine until 

 thoroughly incorporated, then mixed with gold size. The 

 mixture should be thin enough to work with a brush. No 

 more of the cement should be made than is required for 

 present use, as it soon sets and becomes unworkable; but a 

 stock of the materials may be kept ready ground in a bottle. 



454. Lovett's Cement (Journ. Roy. Mic. Soc., 1883, p. 786). 

 Two parts white-lead, 2 parts red oxide of lead (minium), 3 

 parts litharge. To be ground very fine, mixed dry, and kept 

 so in a bottle. When required for use mix a little of the 

 powder with gold size to the consistency of paint, taking care 

 that no grit gets into it. 



455. Apathy's Cement for Glycerin Mounts (Zeit. f. wiss. 

 Mik., vi, 2, 1889, p. 171). -Equal parts of hard (60 C. melt- 

 ing-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. On cooling this forms 

 a hard mass, which is used by warming and applying with a 

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

 cement does not run in, and never cracks. 



456. AspinalTs Enamel. STANLEY KENT (Journ. Roy. Mic. 

 Soc., 1890, p. 821) finds this of great use, both for ringing 

 slides and making cells. 



