APPENDIX. 297 



an ordinary photographic camera to the microscope, of 

 which a brief description will be found in the u Quarterly 

 Journal of Microscopical Science," 1876, p. 111. It ap- 

 pears to have yielded good results, but for wet prepara- 

 tions has the disadvantage that the microscope must be 

 placed horizontally. 



Employment of Eosin as a staining fluid, 

 Dilute solutions of eosin, an aniline-preparation newly 

 introduced into commerce, have recently been much re- 

 commended for coloring the tissues. The dye can be 

 used dissolved either in water or alcohol. For the watery 

 solution Dreschfeld recommends a strength of about 

 1 per 1000; this takes from a minute to a minute and 

 a-halfto stain sections; they are subsequently put for 

 a very short time into water slightly acidulated with 

 acetic acid, and then either examined in glycerine or 

 mounted in dammar. For portions of tissue which are 

 to be hardened in alcohol, the process of hardening and 

 staining can be effected simultaneously by the employ- 

 ment of an alcoholic solution of eosin. The color im- 

 parted by eosin is a rose-red. (E. Fischer, u Arch. f. Micr. 

 Anat." 1875, p. 349 ; J. D resell leld, "Journal of Anatomy 

 and Physiology," Oct. 1876.) 



