222 T 1 1 !•: A M E R U A N 310N T 1 i h \ | An^-.. 



of iiott' who do iioi t'xliiltit arc Crouch and Swift of London, 

 and Klonno ami Mueller of Berlin, so that tlie foreign reprcsi-n- 

 tation as n whole is very complete. 



In order to hrinir together niicroseojtisis and niicroseopi's, and 

 promote iliseussiitn and aeipiaintanee, tiic nu'mhors of the sec 

 lion of microscopy of the Chic^igo Academy of Sciences, form- 

 erly the Illinois State Microscopical Society, have made an ex- 

 hiltit, where they have on exhibition not only specimens of the 

 leading kinds of microscojies, but a larger number of mounted 

 objects and photo-micrographs madebythoir members. De- 

 monstrations of methods of mounting, and instruction in the 

 use of the microscope and testing of lenses are given every other 

 day by experts, and the exhibit which is in section K of the 

 North gallery of the Liberal Arts Building next to the Bausch 

 an<l Lomb display, is designed for hea<l(iuarters for all inter- 

 ested in microscopy, when attending the Fair. 



Diatoms. — H. L. Smitii, LL. D., of Ilobart College, our 

 best known authority on diatomacea>has sold to Dr. F. E. Hod- 

 ges, F. R. M. S., of Indianapolis, Tnd., his entire lil)rary on that 

 subject, his collection of thousands of valuable slides, more 

 than 4(KX) bottles of cleaned diatoms; also, all of the large col- 

 lection of diatomaceous earths with(»ut making any reserve. 



A Method of Mounting Peritheciaof Erysiphe. — Remove 

 the {leritliecia with a spatula and place tiieni in the center of 

 the slide. Cover them with hydrate of potash and let them soak 

 for a few minutes. Then ])ress them with a cover-glass and 

 partially s(juee7-e out the asci. Wash out the potash solution 

 with a few drops of alcoliol. Then fiood with eosin. ^\'asll out 

 the eosin with suflicient alcohol. Then mount in benzole 

 balsam. You will have a beautiful slide showing anc(!p'acles, 

 asci and spores. The spores will take the deepest stain and 

 will stand out ])rominently. 



How to Produce Pretty Crystals of Borax. — Make a sat- 

 ur;ited aijueous solution of borax. Place a drop of Ibis solution 

 on the center of the slide. Set the slide on a window-sill wherj; 

 the draft will affect the slide. Let the pre))aration stand uutil 

 the mass is crystalized. Beautiful cry.stals suitable for an inch 

 objective will be formed. 



