1891.] MICROSCOPICAL JOURNAL. 123 



i-35ooths of an inch, and Pleurosi^'ma strigosum i-2400ths of an inch. 

 Or expressing the spaces and times by other units, we find that the most 

 active required somewliat more than three minutes to accomphsh move- 

 ments whose sum would make-one inch, and the slowest nearly an hour 

 to perform the same feat." Possibly some one may wonder how in the 

 world under such circumstances they manage to get so quickly out of 

 the field, and that may lead him to inquire how large a field they really 

 cross. 



In conclusion, let me again strongly urge the student to make con- 

 stant use of the Binocular in the examination of these forms. 



[the end.] 



The Annual Soiree of the Washington Microscopical Society. 



By ROBERT W. SMILEY, 



WASHINGTON, D. C. 



The seventh annual soiree of the Washington Microscopical Society 

 was held in the halls of the High School building on the evening of 

 April 31, 1891. After listening with pleasure to the illustrated address 

 by the president. Dr. Thomas Taylor, the large audience dispersed 

 through the corridors to view the interesting objects displayed. The 

 following exhibits were made : 



By Dr. G. N. Acker, with Zeiss and Hartnack : Section of human 

 lung, and Nailer's lung. 



By Dr. W. VV. Alleger, with B. & L. : Trichina. 



By Dr. E. A. Balloch, with Zentmayer : Stomach of turtle. 



By Dr. I. W. Blackburn, with Zentmayer: Tumor of brain, patho- 

 logical specimens, and knife carrier. 



By Prof. E. S. Burgess, with B. & L. : Various tissues of plants, 

 showing their structure. 



By Dr. C. T. Caldwell, with B. & L. : Photo-micrographs. 



By Dr. A. B. Coolidge, with B. & L. : Transverse section of ostrich 

 egg-shell. 



By Dr. Cooper Curtice, with B. & L. : Trichinse. 



By Dr. H. A. Dobson, with B. & L., special : Brazilian beetle. 



By Ml". W. C. Duft', with B. & L., universal : Section of finger. 



By Mr. H. H. Doublebay, with Crouch : Circulation of blood in fish. 



By Dr. J. M. Flint, with B. & L., College: Foraminifera. 



By Mr. Richard Foster, with B. & L. (polariscope) : Quartz crys- 

 tals between mica, and infusoria. 



By Dr. E. A. Gibbs, with Beck's Ideal, and B. & L. : Polycystina, 

 and pond life. 



By Mr. John Grinsted, with B. & L. : AmcEba. 



By Dr. H. L. E. -Johnson, (exhibit not catalogued). 



By Dr. D. S. Lamb, with B. & L., Model : Skin of frog (injected), 

 and ciliated epithelium of oyster. 



By Dr. J. Melvin Lamb, with B. & L. : Tubercle bacilli, phthisis, 

 (1 objective), and the same after treatment with Koch's lymph. 



By Dr. Collins Marshall, with Qiieen's Acme, No, 3 : Crystallized 

 gold. 



By. Dr. V. A. Moore, with Zeiss, No. i : Typhoid fever bacilli, 

 showing flagrella. 



