1897] MICROSCOPICAL JOURNAL. 329 



face on which it is to stand, level and tirm. As the camera 

 to be used only extends *)in., a box-like extension piece — 

 addinjr, say, an extra 4in. should be made and fitted to 

 the front. The camera is secured to one end of the board 

 by means of a usual tri])od screw jjassed from beneath 

 throu<,'-h the long- slot, and the microscope is so placed, 

 turned horizontally on its stand, that the eyepiece points 

 centrall}' throug-h the usual lens mount into the camera, 

 the junction between the two beinj^ made lig^ht-tight by a 

 small velvet sleeve having- elastic bands at each end. The 

 ordinary focusing--screen is utterly useless for micro- 

 graphic work, it being necessary to use a piece of thin 

 patent plate glass, having lines ruled on one side with a 

 diamond. Correct focus is obtained when these lines and 

 the image are seen in focus together through a compound 

 focusser. The condenser and lamp (if the last is used) 

 are, of course, arranged at the other end of the board op- 

 posite the microscope and camera. 



MICROSCOPICAL MANIPULATION. 



Staining Insects' Wings. — Dr. Brodie has given much 

 attention to the setting up and preservation of insects. 

 The following mode of staining the wings of insects which 

 he has devised, will be both useful and interesting. Place 

 the whole insect in a strong alcoholic solution of fuchsin, 

 aud allow it to remain there for forty-eight hours. 'J^hen 

 transfer the insect to water with a pair of line forceps, and 

 wash it until no more color comes away, changing the 

 water if necessary. While the washed insect floats in clear 

 water, slip a microscope slide, holding the insect on it with 

 a tine needle, separate the wings from the body with a tine 

 scalpel, and remove the bod}'. 1^'loat the wings into posi- 

 tion on a drop of clear water, remove excess of water with 

 blotting-paper and allow to dry. ^l^hen place a drop of 

 thick Canada-balsam near them and heat over a spirit-lamp. 

 Tilt the slide to allow the liquetied balsam to flow over the 

 wings, lower a cover-glass gently into position and allow 

 to cool. On examination the veins will ])e found red, the 



