90 THE AMERICAN MONTHLY [Mch 



MICROSCOPICAL SOCIETIES. 



The Academy of Science of St. Louis. — At the meeting 

 of the Academy of Science of St. Louis of February 5th, 

 1900, some 250 persons were given a demonstration of the 

 use of the microscope in the sciences, arts and industries, 

 by experts, under the direction of Dr. H. M. Whelpley as 

 follows : Anatomy, Dr, R. J. Terry, Bacteriology, Dr. 

 Amend Ravold ; Blood examination, Dr. Ludwig Bremer ; 

 Botany, Mr. H. F. Roberts ; Diseases of forest trees, Dr. 

 H. Von Schrenk ; Drug adulterations, Mr. O. H. Elbrecht; 

 Flour Inspection, Mr. Victor Goetz ; Insects parasitic on 

 man, Mr. C. F. Baker ; Living protoplasm, Dr. Otto A. 

 Wall, Jr.; Microphotography, Mr. Robert Benecke ; Min- 

 eralogy, Dr. G. Hambach ; Photographic dry plate testing, 

 Mr. Robert Benecke ; Photomicrography, Dr. Adolph Alt; 

 Physiology. Dr. Hartwell N. Lyon ; Seed adulterations, 

 Mr. F. M. Maas : Spice adulterations, Mr. William K. II- 

 hardt ; Textile fibers, Mr. Peter J. Weber, Jr. ; Trichina, 

 Dr. C. C. Crandall. The Historical Society rooms were 

 open to the Academy members and their guests. The 

 Society's important collections, as well as the demonstra- 

 tion offered by the Academy, proved a source of interest 

 and instruction to the ladies and gentlemen present. 

 William Trelease, Recording Secretary. 



MICROSCOPICAL APPARATUS. 



A Photomicrographic Apparatus. — By Dr. W. Measures, 

 made by Messrs. Zeiss, of Jena. The apparatus compri- 

 ses a microscope and camera for the photography of min- 

 ute objects, and a lantern for the projection of microscopic 

 slides. The lantern can be readily adapted for the exhibi- 

 tion of ordinary lantern slides, and also for projecting im- 

 ages of opaque objects on the screen. The camera is fitted 

 on a separate stand, with a simple arrangement for attach- 

 ment to the microscope, and another for focussing. When 

 the lantern is to be used it is only necessary to remove the 

 stand bearing the camera, and the rest of the apparatus is 



