28 THE AMERICAN MONTHLY [Jfin 



meagre intet^ument which means a meagre store of food 

 immediately at hand." 



MICROSCOPICAL SOCIETIES. 



Washington. — On Tuesday evening-, Nov. 21, officers 

 were elected for 1899-1900: President, Prof. PaulBartsch ; 

 Vice President, Dr. Rupert Norton ; Recording- secretary 

 L. M. Moore; Treasurer, Dr. Robert Reyburn ; Curator, 

 W. H. Seaman. A paper was presented on "Medicine 

 Droppers and Measurement of Drops." The society meets 

 at 714 Thirteenth street on the second Tuesday of each 

 month except in summer. 



Royal Microscopical Society. — The President called at- 

 tention to an old microscope made by Gary, presented to 

 the Society by Mr. Gleadow, which was a very interesting- 

 addition to the Society's collection. An instrument of the 

 same design was fig-ured in the Journal for 1898, p. 474. 

 Messrs. Watson and Sons exhibited their new School mi- 

 croscope, which was provided with a diagonal rack-and-pin- 

 ion coarse adjustment, but no fine adjustment ; their idea 

 being- to produce a strong- well-made instrument at a low 

 price. Dr. Dalling-er had seen this instrument, nd thoug-ht 

 it would admirably answer the purpose for which it was in- 

 tended ; the coarse adjustment was so well made that he 

 had no difficulty in focussing a ^in, objective with it. The 

 President also thoug-ht the microscope was strongly made 

 and well fitted, and would be found to be a very useful in- 

 strument. Messrs. Watson also exhibited a new form of 

 eyepiece named the "Holoscopic" which was fitted with an 

 adjustment to render it either over-or-under-corrected,and 

 suitable for use with either achromatic or apochromatic ob- 

 jectives. Dr. Measures exhibited a microscope for photo- 

 microg-raphy made by Zeiss, having a new form of fine ad- 

 justment which admitted of the arm being made of any 

 length without throwing- extra weight upon the fine-adjust- 

 ment screw. Dr. Dallinger considered the way in which 

 the speed of the fine adjustment had been reduced was 



