490 APPENDIX III. 



W. 



Wax, Small wax candles or " vestas ". For making wax-spots on micro- 

 slides to protect objects against pressure. See p. 442. 



X. 



Xanthoproteid reaction, for protoplasm. With successive use of nitric acid 



and ammonia, protoplasm colours yellow. 

 Xylol. A clearing reagent for micro-sections, and a medium for Canada 



balsam. 



Z. 



Zinc chloride. Used as a mordant. See p. 111. 



