358 THE AMERICAN MONTHLY [Dec, 



In tlic horizontal position, the hnih of the instrument rests 

 iJ«jiiaroly on tlie posterior foot of the tripod, thus insurin^i great 

 steadiness. The fine adjustment is eoujpensated to take up 

 any wear in tlie micrometer screw or its bearings. In the 

 simpU'r form there is an undersUige jacket to take any illumin- 

 atinir ajtparatus ; but a centering and rack-work substago can be 

 tilted at any time without liaving to return the instrument to 

 the makers as all parts and holes for screws are made to accur- 

 ate gauge. 



A stand l)y Leitz. of Wetzlar, was shown by Mr. C'urties. It 

 is the (irst (lerman microscope made on an English model. 

 The foot is of the bent-claw pattern. It has the Nelson horse 

 shoe stage with sliding-bar The fine adjustment and fitting 

 lor condenser follow the Zeiss model. 



T. F. 8mith gave a demonstration of the effect of orthochrom- 

 atic plates in the corrections of the objective, and his views on 

 the structure of the valve of Pleurosujma angulatimi, illustrated 

 by photographs and oxy-hydrogen lantern. 



Lincoln Microscope Club, Lincoln. Neb. 



Oclober oli^i. — Dr. Ward, Associate Professor of Zoob'gy in the 

 University of Nebraska was recommended for membership by 

 the executive committee. Prof. Bessey showed a Ryder auto- 

 matic microtome, exj)laining its rn(>rits and what he considered 

 its defects. Mr. Pound sjtoke briefly of the transactions of the 

 San Francisco Microscopical Society. 



Among the slides exliibited was a fish parasite, D'ldomum no- 

 (lulosum. shown by Dr. Ward. This species, not reported from 

 this country, was found in aliun<lance in Lake Michigan tliis 

 summer. 



November 2H. — Dr. Bessey sjioke l)riefly of the Reinhold-CJil- 

 tay microtome and also of Zimmermann's Botanical Microtech- 

 nique 'translated by Humj)hrey). Mr. Dales spoke of his work 

 in collar correcting a 1-20 immersion objective made for a 10 

 inch tube for an 8 incli tube. 



Amf)ng the interesting slides exliil)ited, was a lung parasite 

 found in the lung of a cat at Ann Arl>or, Michigan, by Dr. Ward, 

 which he believed to be identical with the Asiatic lung parasite 

 — Dist&mum tceJitennnnnii. 



