1894.] MICROSCOPICAL JOURNAL. 223 



the gum-water will run along the whole line of its OAvn accord. 

 When dry the diatoms will be fixed, but even then great care is 

 required in putting on the cover-glass. — No Sig. 



MICROSCOPICAL SOCIETIES. 



Washington, D. C, L. M. Mooers, Secretary. 



May 8, 1894. — This evening was held at the High School 

 Building the 10th annual soiree. Dr. E. A. Balloch, a member 

 of the committee of arrangements and an ex-President, intro- 

 duced the speaker. Dr. E. A. Gibbs, who read the address of the 

 President. The subject of the address was, " Some of the Uses 

 of the Microscope," illustrated by stereopticon views. The ap- 

 paratus employed in making photomicrographs by sun light 

 and lamp light, was shown on the screen and explained. 



The germs of tuberculosis, diphtheria and cholera were 

 shown and attention called to the importance of a microscopical 

 examination as an aid to the physician in making a prompt 

 diagnosis. A short description of trichina spiralis was also 

 given. Diatoms and Foramenifera showing the lower forms of 

 vegetable and animal life, fat crystals of various oils, crossed 

 ink lines showing " overflow" where both lines were wet, and 

 lines of demarkation where the first was dry, and the applica- 

 tion of same in detecting forgeries in writing, illustrated by a 

 letter from a forged document, also a photograph of a promis- 

 sory note in which the erasure of the words •' or bearer" was the 

 cause of a law suit. 



With a microscope attachment to the stereopticon, the forma- 

 tion of crystals from solutions of copper sulphate and barium 

 chloride was shown on the screen. A full list of objects shown 

 was as follows : 



1. Photography. Direct light. Lamp light. 



2. Heliostat. Sun light. 



3. Heliostat. 



4. Photography. Opaque object. Lamp light. 



5. Photography. Written matter. 



6. Tubercle bacillus. 



7. Diphtheria. (Klebs Loeffler bacillus). lu membraue. 



8. Diphtheria. Same from a culture. 



9. Cholera spirillum or Koch's comma bacillus- 

 10. Colonies from air. 



