358 THE AMERICAN MONTHLY [Dec, 



In the horizontal position, the Hmb of the instrument rests 

 sqiiarel}' on the posterior foot of the tripod, thus insuring great 

 steadiness. The fine adjustment is compensated to take up 

 an}' wear in the micrometer screw or its bearings. In the 

 simpler form there is an understage jacket to take any illumin- 

 ating apparatus ; but a centering and rack-work substage can be 

 fitted at any time without having to return the instrument to 

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

 ate giiuge. 



A stand by Leitz, of Wetzlar, was shown by Mr. Curties. It 

 is the first German 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 

 for condenser follow the Zeiss model. 



T. F. Smith 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 Pleurosigma angulaium, illustrated 

 by photographs and oxy-hydrogen lantern. 



Lincoln Microscope Club, Lincoln, Neb. 



October 31st. — Dr. Ward, Associate Professor of Zool 'gy in tlic 

 University of Nebraska was recommended for membership by 

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

 matic microtome, explaining its merits and what he considered 

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

 San Francisco Microscopical Society. 



Among the slides exhibited was a fish parasite, Distomum no- 

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

 this country, was found in abundance ia Lake Michigan tiiis 

 summer. 



November 28. — Dr. Bessey spoke briefly of the Reinhold-Gil- 

 tay microtome and also of Zinimermann's Botanical Microtech- 

 nique (translated by Humphrey). Mr. Dales spoke of his work 

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

 inch tube for an 8 inch tube. 



Among the interesting slides exhibited, was a lung parasite 

 found in the lung of a cat at Ann Arbor, Michigan, by Dr. Ward, 

 which he believed to be identical with ihe Asiatic lung parasite 

 — Distomum westermannii. 



