1 82 MICRO-CHEMISTRY. [CH. VII. 



air some distance above an alcohol or Bunsen flame ; mount in xylene balsam 

 (? 3°°), or one may fuse the salt with the balsam (? 300) ; 5. Copper acetate ; 

 Mount dry (ji 231) ; 6. Copper sulphate. Crystals much more satisfactory when 

 examined in the "mother liquor." 7. Lead nitrate; 8. Mercuric chlorid (corro- 

 sive sublimate), mount in xylene balsam (§ 300, 240). 9. Nickel nitrate, obtain 

 crystals by heating; mount in xylene balsam ({! 240, 300) ; to. Potash alum ; ir. 

 Potassium chlorate ; 12. Potassium dichromate. Compare specimen crystallized 

 by heat and spontaneously; mount dry or in xylene balsam (§ 300). 13. Po- 

 tassium iodide. Dilute with one or two volumes of water, and crystallize by heat. 

 14. Potassium nitrate; 15. Potassium oxalate; 16. Potassium sulphate; 17. Sali- 

 cin. Fuse the dry saliciu on the cover-glass, mount dry, or preferabl}' fuse in 

 balsam {\ 300). 18. Salicylic acid. Make a 10% solution in 95% alcohol ; let it 

 crystallize spontaneously in the air; mount dry ($ 231). 19. Sodium chlorid 

 (common salt). Mix sat. aq. sol. with one or two volumes of water, and heat ; 

 mount dry or in balsam. 20. Sulphonal (# 218). 



I 322. For directions and hints in micro-chemical work and crystallography, 

 consult the various volumes of the Journal of the Roy. Micr. Soc. ; Zeitschrift fur 

 physiologische Chemie, and other chemical journals ; Wormly ; Kl£ment & Re- 

 nard ; Carpenter-Dallinger ; Hogg; Behrens, Kossel und Schiefferdecker ; Frey ; 

 Dana, and other works on mineralogy ; Davis. 



