220 



THE AMERICAN MONTHLY 



[Nov. 1881. 



lantern and there were several rare and 

 beautiful objects under the microscope. 

 Lucia F. Clarke, Cor. Secretary. 



CENTRAL NEW YORK (SYRACUSE.) 



A regular meeting of the Club was held 

 on Tuesday evening September 27th at 

 the office of Dr. Aberdein with a good 

 attendance of members. Mr. E. H. Grif- 

 fith, of Fairport, and Mr. Adelbert Cronise, 

 of Rochester, were present as visitors. 

 After the transaction of the usual routine 

 business, Dr. A. Clifford Mercer read a 

 paper, illustrated by black-board diagrams, 

 on Prof. Abbe's theory of angular aper- 

 ture. Dr. Mercer treated his subject ably 

 and a demonstration of the somewhat ob- 

 scure details of wave lengths and diffrac- 

 tion was very clear. 



The Secretary then read a paper on 

 Preservative Fluids, after which Dr. Chas. 

 R. Lee exhibited some slides showing the 

 appearance of a human lung when in a 

 normal condition and when in a state of 

 disease. 



A. L. W. 

 ILLINOIS. 



The first meeting of the State Micros- 

 copical Society for the present season was 

 held at the rooms of the Society in the 

 Academy of Sciences, Friday evening, Oc- 

 tober 14th, the President, Dr. Lester 

 Curtis, in the chair. 



After the transaction of routine busi- 

 ness, Mr. Stuart described the microsco- 

 pical structure of some vegetable drugs. 

 The subject is not suitable for abstraction, 

 and requires illustrations to be useful. 



His paper was followed by one by Dr. 

 Curtis, describing a new stand made for 

 him by Bulloch. This stand presented 

 some novel features, among the most 

 striking was a mechanical stage of extreme 

 thinness, admitting light at an angle of 

 160°. The movements were effected by a 

 double pinion above the stage, an arrange- 

 ment pronounced by those familiar with 

 the operation of the contrivance, as ex- 

 ceedingly useful and convenient. 



The stand aroused considerable interest 

 as did also a right angled camera lucida 

 of German manufacture which was adapt- 

 ed to it, the superiority of which over the 

 ordinary form was so marked as to be un- 

 mistakable on trying it, even under the 

 disadvantages of a crowded room and 

 constant jar. After a discussion of the 

 papers, the meeting adjourned. 



E. B. Stuart, Secretary pro tern. 



Exchanges. 



[Exchanges are inserted in this column without 

 charge. They will be strictly limited to mounted 

 objects, and material for mounting.] 



Unmounted objects, Foraminifera, Spicules, Plant- 

 hairs, Zoophytes, etc., in exchange for other objects, 

 mounted or unmounted. 



E. PINCKNEY, Dixon, 111. 



Wanted — First-class mounts of double-stain vege- 

 table preparations in exchange for first-class insect 

 preparations. H. S. WOODMAN, 



P. O. Box 87, Brooklyn, E. D., N. Y. 



Well-mounted Histological and Pathological slides 

 in exchange for other first-class slides. 

 W. H. Bates, M.D., 184 Remsen St. Brooklyn, N. Y. 



Wanted — first-class prepared and crude material, or 

 mounted objects, in exchange for diatoms in situ or 

 other first-class crude material, or for mounted objects. 

 M. A. BOOTH, Longmeadow, Mass. 



Wanted — Human Muscle with Trichina, in ex- 

 change for well-mounted slides of vegetable drugs. 

 OTTO A. WALL, M. D., 

 1027 St. Ange Ave., St. Louis, Mo. 



Niagara River Filterings for mounted slides. 



H. POOLE, Buffalo, N. Y. 



Wanted — good gatherings of Diatoms, fossil or re- 

 cent, especially of test forms. Liberal exchange in fine 

 slides : prepared or rough material. Lists exchanged. 



C. L. PETICOLAS, 635 8th Street, Richmond,Va. 



Section of Brain, stained, showing Tubercular Men- 

 ingites ; also Carcinoma Cerebri. Please send list. 

 L. BREWER HALL, M. D., 27 South i6th Street. 



Good, uncleaned Diatomaceous material containing 

 Arachnoidiscus^ Heliopelta^ Pleurosigtna, Istkmia, 

 Triceratizim, Surirella getitma and Terpsinoce 

 musica wanted, in exchange for well-mounted slides 

 of arranged diatoms, etc., or cash. 



DANIEL G. FORT, Oswego, N. Y. 



Well-mounted Histological and Pathological slides, 

 in exchange for oth&r /irst-class slides. 



LEWIS M. EASTMAN, M. D., 

 349 Lexington Street, Baltimore, Md. 



For exchange : Mounted thin sections of whale- 

 bone, soapstone, serpentine, albite, feldspar, etc.; 

 also opaque mounts of several very beautiful fossil- 

 iferous limestones. 



Rev. E. A. PERRY, Quincy, Mass. 



Well-mounted, typical Pathological and injected 

 Histological preparations, in exchange for other well- 

 mounted slides, Diatoms, Algae and Fungi preferred. 

 HENRY FROEHLING, 

 59 N. Charles Street, Baltimore, Md. 



