THE MICROSCOPE. 171 



Iodine Green. — Iodine green crystals one tenth grain to 35 

 grains distilled water. It stains quickly and alcohol does not re- 

 move the color at once. It stains chromic acid preparations well. 



Perenyi's Hardening Fluid. — 



Nitric acid, (10 per cent.) . . - 4 parts. 



Alcohol, 3 parts. 



Chromic acid, (.5 per cent.) - - - 3 parts. 

 Place ova in here for four or five hours, then twenty-four hours 

 in 70 per cent, alcohol, then in stronger and lastly in absolute 

 alcohol. Surprising results are claimed for this in embryological 

 work. 



For mounting mosses and hepaticae, M. Delonge recommends 

 glycerine-gelatine. 



Finishing Varnishes. — The vehicle. 



Gum dammar, - - - 3 ounces. 



Gum mastic, - - - - i ounce. 



Benzol, - - - - 6 ounces. 



The colors. 



White, .... oxide of zinc. 



Blue, ----- ultramarine. 



Red, - . - . carmine. 



Black, ----- lamp black. 



Green, . - - . verdigris. 



Yellow, ----- chrome-yellow. 



Triturate the color with the vehicle in a mortar. 



Davis. 



Camphor Water. — 



Distilled water, - . . i quart. 



Tincture camphor, - - - i drachm. 



Mix well. Use only the clear liquid. 



Prof. Richardson, of Philadelphia, shows glaring errors in Dr. 

 Cutter's work on "cereal foods under the microscope," published in 

 GaillarcVs Medical Weekly. He places Dr. Cutter under too strong 

 a scientific illumination. 



