224 THE AMERICAN MONTHLY [July, 



11. Trichina spiralis. 



12. Diatoms. Arachnodiscus elirenl)ergii. 



13. " Triceratium distiuctum. 



14. " Same showing dots. 



15. Diatoms. Terpsinaj musica. 



16. Diatoms. Pleurosigma angulatum. 



17. Foramenifera. 



ITy. Mimmulit«s laevigatas. 



18. Fat Crystals. Cocoa nut fat. 



19. Fat Crystals. Palm oil. 



20. Fat Crystals. Carapa. Plain. 



21. Fat Crystals. Chaulmugra oil. 



22. Fat Crystals. Beef. 



23. Fat Crystals, Butter. 



24. Crossed ink lines, both wet. 



25. Crossed ink lines, first dry. 



26. An ink line and a pencil line. 



27. Letter "J" from forged document. 



28. Promissory Note. 



29. Shows ''e" in "Bearer" and cross line. 



30. Shows "a" in " Bearer" and cross line. 



31. Shows lines crossing "1" in "Charles." 



32. Section of Oak stem. Crystals. 



After the address, the exhibits by members were on view. 

 Over 60 exhibits were made by 31 members, a full list of which 

 may be found in Tlte Microscope for April. 



MICROSCOPICAL NOTES. 



Vaccination is much more effective if practiced at once after 

 recovery from tyi)hoid fever, but no one knows why this is so. 



Gallic and Tannic Acid Tests. — To a solution of tannic 

 acid, add solution of chloride of barium and a pink precipitate 

 will result, gradually darkening. To a solution of gallic acid, 

 add a solution of potash and of chloride of barium and a blue 

 precipitate will result. — Fred'k Davis. 



FOR SALE. — Crouch Intermediate binocular, circular glass stage, me- 

 chanical centering on substage, four eye pieces, achromatic condenser polariz- 

 ing attachment, stops lor dark ground and oblique illumination, parabaloid, 

 two solid eye pieces made by Spencer. All in perfect order and have been 

 used very little. $100. GEO. A. BATES, Auburndale, Mass. 



