160 



THE AMEKICAN MONTHLY [August, 1880. 



n 



or no experience as yet, in that direction. 



The President exhibited a couple of 

 specimens of Hydra vulgaris under an 

 •/ir, and a Spencer " professional " \. 

 Some mounted slides were exhibited by 

 other members. 



The same officers were reelected for 

 the ensuing year, after which the meeting 

 adjourned. 



GRIFFITH CLUB, MICH. 



On the evening of June 21st, this Club 

 gave a " soiree," which proved to be a 

 very successful entertainment. 



After the exhibition of many of the 

 more familiar objects, a series of anatom- 

 ical specimens were shown by Prof. C. H. 

 Stowell. The two most interesting views 

 he gave were the circulation of blood in a 

 frog's tongue, so shown upon the screen 

 that streams of blood-corpuscles could be 

 distinctly seen chasing each other along 

 the arteries and veins, and finally the 

 beating of a frog's heart. The latter re- 

 presentation was accomplished by " shock- 

 ing " five or six frogs so as to render them 

 temporarily insensible, and while in this 

 condition destroying the brain with a 

 probe to render them permanently in- 

 sensible ; then by opening the skin upon 

 the stomach, the heart was laid bare and 

 the frog, laid upon its back upon a flat 

 piece of cork, was held so that the heart 

 and immediate surroundings were re- 

 flected upon the screen. Although the 

 real size of the heart was smaller than the 

 end of one's little finger, it was magnified 

 to the dimensions of 10 x 14 inches, and the 

 color, shade and pulsations were impres- 

 sively graphic and true to every detail of 

 of life. The only difficulty experienced 

 was that the intense heat of the lime 

 light cooked the flesh after a few pulsa- 

 tions and required the substitution of a 

 fresh specimen. Prof. Stowell says that, 

 with the exception of two or three class 

 demonstrations at Ann Arbor, this is the 

 first time such an exhibition has been 

 given in public. 



ILLINOIS. 



At the May meeting of the Trustees 

 of the Illinois State Microscopical Society, 

 a section in Histology was organized for 

 work during the summer vacation. 



The first meeting was held May 21st, 

 at which. Dr. Lester Curtis was chosen 

 President, and Dr. Frederick W. Mercer, 

 Secretary. 



Meetings are held on the third Thurs- 

 day of each month. 



Exchanges. 



[Exchanges are inserted in this column without 

 charge. They will be strictly limited to mounted 

 objects, and material for mounting.] 

 Polyzoa, Palates of MoUusca, Foraminifera, Sponge 

 and Holothurian-Spicules, Synapta-Anchors, Chirod- 

 ota-Wheels, Echinus-Spines, Minute Sea Shells, in ex- 

 change for Polyzoa, Foraminifera, Histological and 

 Pathological preparations, etc. Also, a quantity of 

 Sea Shells in exchange for Land and Fresh-Water 

 Shells. 



F. M. HAMLIN, M. D., Auburn, N. Y. 



J. J. B. Hatfield, Arsenal Avenue, Indianapolis, 

 Indiana, will exchange Bleached Plant-Sections for 

 good Diatomaceous material. List furnished on ap- 

 plication. 



Pleurosigmas and other unmounted Diatoms, both 

 Fresh Water and Marine ; also Marine Algae, Ferns, 

 and a large quantity of miscellaneous microscopical 

 material in exchange for good mounted objects. 



M. A. BOOTH, Longmeadow, Mass. 



To exchange, well-mounted Slides of Hair for 

 mounted or unmounted specimens of hair from the 

 rarer animals ; lists exchanged. WM. HOSKINS, 

 208 S. Halsted street, Chicago, 111. 



Nicely mounted Slides (opaque) of the Coal-tar 

 Derivatives, chemically prepared, crj'stalline in form, 

 showing their beautiful colors, in exchange for other 

 well-mounted material. Chemical name and formula 

 attached to each Slide. About a dozen varieties on 

 hand. F. L. BARDEEN, M.D., 



3oJ^ Meigs street, Rochester, N.Y. 



Vanadate of Ammonia, (N H*) '^ V O , Slides for 

 the Polariscope in exchange for other Slides. 



H. POOLE, Practical School, Buffalo, N. Y. 



Slides mounted from injected Frog's Gall-bladder, 

 Liver, Kidney, Stomach, Intestine and other parts, 

 exchanged for other good and interesting prepa- 

 rations. C. BLASDALE, M. D., 



Jericho, Queens Co., N. Y. 



Well-mounted, selected and arranged Diatoms, for 

 good histological, pathological or anatomical prepara- 

 tion. State what you have, and terms of exchange. 

 W. W. RINER, Greene, Iowa. 



Foraminifera from Sponge-sand, Marl-sand, and 

 Chalk ; Transparent Prisms of Carbonate of Lime 

 from fossil Shells ; Fresh and Salt Water Diatoma- 

 ceous material ; Carapaces of Rhizopods ; polished 

 sections of Fossiliferous Limestones, Corals, etc., to 

 exchange for any microscopical material. 



K. M. CUNNINGHAM, 

 Box 874, Mobile, Ala. 



The American Monthly Micro- 

 scopical Journal. 



Issued on or before the fifteenth 

 day of each month. 



Correspondence should be ad- 

 dressed to the Editor, Romyn Hitch- 

 cock, 53 Maiden Lane, New York. 



Terms : $1.00 per year ; single 

 numbers, 15c. To foreign subscrib- 

 ers, bYi francs, or 5 shillings sterling. 



