MOUNTING WINGS OF MOTES. 269 



barraque, or a solution of potassic hypochlorite, known as 

 eau de Javelle, enables one to dispense with the wash of 

 dilute acid. " These bleaching processes preserve the most 

 delicate wings unbroken; and when the specimens are of rare 

 species, rubbed wings can be used, the absence of the scales 

 not being evident after bleaching" (Psyche, i. 97). Legs 

 and other parts of insects may be treated in the same way. 



Mr. Chambers suggests (Can. Ent. viii. 39), for Micros, 

 placing the wing upon a glass microscope-slide in from one 

 to three or four drops of a strong solution of potash, and 

 after putting a cover-glass over the wing, holding the slide 

 over a flame until it begins to boil, removing it at the first 

 sign of ebullition, when the wing will be found to be de- 

 nuded; it may then be drawn with the camera, and after- 

 wards mounted for permanent preservation. 



Mounting the Wings of Microlepidoptera. Prof. C. H. 

 Fernald mounts the wings of Microlepidoptera in cold glycer- 

 ine; after having been bleached by Dimmock's method 

 (which, for bleaching, is to be recommended), the wings 

 are transferred to the slide direct from the water in which 

 they are washed, then allowed to dry (sometimes hastened 

 by holding the slide over the flame of a lamp) ; and, when 

 quite dry, a drop of glycerine is to be added, and the cover 

 at once put on. When the glycerine has penetrated around 

 the edges so as to completely saturate portions of the wing, 

 the scales at once become transparent, and the structure is 

 clearly apparent. 



By holding the slide over the lamp till ebullition takes 

 place, the glycerine will be found to replace the air under 

 the concave portions of the wings, without any injury to 

 the structure; and even in those refractory cases where the 

 glycerine has been allowed to boil for a considerable length 

 of time, no injury was found to be done to the wing-mem- 

 brane. (Anier. Month. Micr. Journ., i. [1880] p. 172.) 



Mounting the Wings of Macro lepidoptera. Dr. H. Dewitz of Berlin 

 removes the colors and scales, for the purpose of studying the 

 venation, by means of eau de Javelle, cutting off both wings on one 



