20 The Miceoscope. 



At the adjoining table, the next exhibitor, Arthur M. Hickox, 

 showed the crystals of brucine, using polarized light. Brucine is an 

 alkaloid extracted from Strychnos Nux vomica, and its oddly ar- 

 ranged crystals polarize brilliantly. 



Dr. Thomas Morffew exhibited a slide showing the perfection to 

 which microscopic engraving on glass can be can-ied. He also 

 showed one of Muller's wonderful " Typen-Platten" of diatoms, the 

 name of each being photographed beneath it. 



The President of the society, Dr. S. M. Mouser, showed a fine 

 line of specimens of anatomical and pathological subjects. An in- 

 jected ileum of the rat was much admired for its beauty. A slide 

 of Bacillus Anthracis was shown with one of the new Zeiss lenses 

 made of the recently perfected optical glass. The crisp definition 

 of this objective was particularly noticeable. 



J. Z. Davis followed with several slides of vegetable sections 

 which had been double-stained. The different layers of tissue 

 were sharply defined and the coloring was brilliant. 



A slide of Bacillus tuberculosis was the subject chosen by Dr. 

 F. Riehl. Using a dry lens and an amplification of 275 diameters, 

 the bacilli were shown with great clearness. 



The absorption bands in the spectra of various colored solutions 

 were shown by Professor Thomas Price with a tnicro-spectroscopic 

 ocular. This method of testing has become of gi'eat value in many 

 directions, notably the detection of blood-stains. The presence of 

 almost inconceivably small particles of coloring matter can be made 

 manifest by this instrument. 



The last exhibitor was F. L. Howard, who showed a fine 

 mount of the beautiful Polyzoan, Bicellaria ciliata, using polari- 

 scopic illumination to produce the glowing tints so much admired. 

 The ingeniously contrived microscopic lamp of this exhibitor also 

 received much favorable attention. 



AMERICAN POSTAL MICEOSCOPICAL CLUB. 



BOX "M" containing two valuable slides of "Cole's Studies" 

 reached the office of The Microscope Nov. 9th. These slides 

 are very interesting to all observers, because all are aware that 

 Cole's preparations are among the first in the world. With these 

 slides came a descriptive pamphlet, illustrated with colored litho- 

 graphs of a certain part of the tissue on the slides, so that those 

 ■who are not usually interested in the ordinary histological specimen 



