204 THE AMERICAN MONTHLY [September, 



eye was projected, as was also the result of photographing with the 

 composite eye of a beetle. 



THURSDAY AFTERNOON WORKING SESSION. 



The forepart of the afternoon session was devoted to the demonstra- 

 tion of practical microscopic work. This session lasted about three 

 hours, and the work done embraced nearly all fields of microscopy, and 

 proved of great interest to the many visitors. The following exhibits 

 were made : 



By E. H. Griffith, F. R. M. S. : Miscellaneous work. 



By H. Gibbes : Hyaline-fibroid degeneration, flagella on spirillum. 



By S. H. Gage : Winkel's marking apparatus for locating minute ob- 

 jects in a preparation. 



By M. D. Ewell, M. D., LL.D. : Micrometry. 



By Mary A. Spink, M. D. : Sectioning and mounting. 



By W. W. Rowlee : Sectioning mature seeds. 



By M. B. Thomas : Sectioning mature pistils. 



By L. D. Mcintosh, M. D. : Attachment for using solar and oxy- 

 hydrogen microscope, with direct or central and oblique illumination 

 and illuminating and projecting opaque objects. 



By F. L. James, Ph.D., M. D. ; Mounting in glycerine, sharpening 

 microtome knives. 



By R. N. Reynolds, M. D. : Sectioning injected material, and mount- 

 ing diatoms. 



By Henry L. Tolman : Methods of preparing slides of blood. 



By G. S. Woolman : Method of using a Spencer homogeneous yV"^^* 

 of wide angle in both oblique and central illumination, using a small 

 hand-lamp, ^-inch wick and edge, at right angle to the mirror for oblique 

 illumination ; and using the same lamp, with addition of Abbe con- 

 denser, with light direct from the lamp, the edge of the flame in the 

 optical axis of the microscope tube ; thus showing that a wide angle 

 objective can be used with facility for both central and oblique illumi- 

 nation, and that it is not necessary in order to obtain good results to use 

 a large wide-wick lamp, and expensive accessory apparatus. 



By J. A. Close, M. D. : Injecting tree frog with special apparatus ; 

 dissecting with Stephenson's binocular ; living trachincE in muscle of 

 white rat ; White's improved life slide ; Close's tadpole slide ; Close's 

 toad plate, and Close's balsam bottle. 



The working session, under the able management of Dr. W. P. 

 Manton, of Detroit, proved to be a valuable feature of the meeting, 

 showing as it did the various uses of the microscope and its accessories. 



The working session was followed by the reading of papers, and the 

 following were submitted and discussed: "A New Form of Stage 

 Micrometer," by Prof. Ewell ; "A New Microscope," by Dr. W. H. 

 Seaman ; " Microscopical Study of the Choroid Plexus," by Dr. Mary 

 A. Spink ; " The Celloidin Method in Botany," by M. B. Thomas. 



The paper by Thomas B. Spence, of Ithaca, N. Y., on the " Com- 

 parative Structure of the External and Middle Ear of the Cat " was 

 read by title only. 



THURSDAY EVENING — THE SOIREE. 



The notable feature of the meeting was the microscopic exhibit given 

 for the benefit of the general public. At 8 o'clock the microscopical 



