300 THE AMERICAN MONTHLY [Sept 



black, while normal blood, takes on a red- violet. In all 

 cases where possible, for the sake of absolute certainty, 

 the urine should be tested for g-lucose by any of the well- 

 known reactions. 



Yellow Fever Microbes. — Dr. Havelburg- announces 

 that the mirobe which he considers the specific cause of 

 yellow fever is found only in the stomach and intestines, 

 but is cultivated by injecting- it subcutaneously intog-uinea 

 pig-s. He finds that a previous injection of blood from a 

 yellow fever convalescesit renders an animal immune to an 

 otherwise fatal dose of injection of the cultivated microbe. 

 — O Brazil Medico. 



MICROSCOPICAL SOCIETIES. 



Quekett Microscopical Club. 



The 352nd meeting- of this club was held on June 18th. 

 It was voted to alter rule 1 of the club's bye-laws making- 

 the vacation three months instead of two, as heretofore. 

 Meetings will be resumed in October. 



R. and J. Beck exhibited a portable binocular microscope 

 with the stag-e and sub-stage entirely removable for con- 

 venience in packing-, Mr. Nelson did not see why this 

 arrangement should be less practical and rig-id than the 

 more complicated and expensive revolving- movement 

 usually employed. Mr. Nelson described the performance 

 of Leitz's new semi-apochromatic 1 — 10th oil immersion 

 objective of 1*3 N. A., which he thoug-ht was the finest 

 lens yet produced at anything like the price — viz., $18.00. 

 He also exhibited one of his new-formula reflecting- loups, 

 and a fine series of enlargements of his well-known photo- 

 micrographs of diatom structure. Mr. A. Earland read a 

 paper on collecting Foraminiferous material, including- 

 directions for cleaning and mounting. Mr. Rousselet 

 read a paper on the male of Proales wernecki — a rotifer the 

 females of which produce g-alls on Vaucheria, in which 

 they reside and deposit their eg-gs. 



