1894.] NEW-YORK MICROSCOPICAL SOCIETY. 75 



which when mounted for the microscope appears quite colorless. 

 The fibre, when mordanted in the manner described, takes a deep 

 blue. 



Methyl Green — This is a favorite stain, especially for vegetable 

 sections, and it is very effective in double staining. When 

 applied to fibres, whether of pure cellulose or of lignin, it produces 

 a deep green if the fibre has been mordanted before staining, 

 while a light green is produced when the order of stain and 

 mordant is reversed. It was applied in a strong aqueous solution. 



Paris Violet. — This is a strong staining medium, readily im- 

 parting its color to almost all fibres, but requiring thorough mor- 

 danting to render it permanent. 



It was used in a concentrated aqueous solution. As will be 

 seen from the specimens, the result is a decided violet, differing 

 in this respect from the bluer shade obtained with Hofmann's 

 violet. 



LIST OF ILLUSTRATING SPECIMENS, 

 Where stain and mordant were applied separately, the former is italicized. 



Cotton fibre, stained with Grenacher's carmine. 



Linen " " " " " 



Cotton " " " Thiersch's " 



" " '■ " borax " 



Linen " " " " " 



Cotton " " " alum and logwood in one solution. 



" " " " alum and /t7^W(7^a' in separate solutions. 



" " " " acetate of alumina and logwood, 



" " " " sulphate of copper and /iT^w^^t/. 



" " " " acetate of copper and /c^K'^^'fl'. 



Linen " 



Cotton " " " alum and brazilwood, 



" " " " acetate of alumina and (5;'«sz7wO(?flf. 



" " " " sulphate of copper and brazilwood. 



" " " " acetate of copper and 3razz7wc£'(/. 



Spruce " " " alum and logwood. 



" " " " acetate of alumina and logtvood, 



" " " " acetate of copper and logxvood. 



Poplar " " '■ alum and logwood. 



" " " " acetate of alumina and logwood. 



" " " " acetate of copper and logwood. 



Spruce " " " alum and brazilwood. 



" " " " acetate of alumina and brazilwood. 



Poplar " " " alum and brazilwood. 



