1892.] MICROSCOPICAL JOURNAL. 21 



Shrubsole announces Streptothcca tamesls as new. It is found 

 every fall and winter at the estuary of the T\\a.xne.s.—Jour. ^uek. 

 Club^ pp. 259-62, with plate. 



Peragello has published a monograph of the pleui'osignia^ rJioico- 

 sigma, dofikinia^ and toxonidea. — Paris, 1891, 10 plates. 



MICROSCOPICAL SOCIETIES. 



Sax Francisco. — William E. Loy, Sec'y. 



November 4^ i8gi. — R. H. Freund exhibited Zeiss' apparatus for 

 counting blood corpuscles. A discussion followed, and it was asked 

 whether or not by this test data might be established whereby one could 

 determine if blood under examination belonged to man or to some of 

 the lower animals. Authorities are agreed that the size and shapes of 

 the red corpuscles are so nearly alike in man and some of the lower 

 animals that some other test must be found. At present Zeiss' appa- 

 ratus is used onl}' for determining the relative proportion of red and 

 white corpuscles, on the variability of which certain diseases can be 

 diagnosed. Mr. Freund also exhibited .some pathological preparations, 

 actinomyces bovi's, diphtheria bacillus^ and typhus bacillus. 



George O. Mitchell reported the results of attempts to make photo- 

 micrographs with the Society's camera, and exhibited some of the work, 

 which was favorably commented on. 



The Secretary reported the receipt of two samples of diatomaceous 

 earth from Henry G. Hanks — one from Maine, showing fresh-water 

 forms ; the other from a well in Adams county, Washington, also 

 fresh-water forms. 



Henry C. Hyde spoke of the death of Judge O. C. Pratt, a life mem- 

 ber of the Society. 



N^ovetnber 18., i8gi. — George A. Merrill and P. S. Barber were elected 

 members. The meeting was then formally adjourned, and Henry C. 

 Hyde, on behalf of the committee, took charge of the exhibit. 



A. H. Breckenfeld exhibited with dark-field illumination a living 

 Hydra vulgaris^ budding, head of Vespa vulgaris, arranged diatoms, 

 a section of Equisctutn (fertile stem), Leplodora hyalina, and seeds 

 of Orthocarpus purpurescens. Dr. E. S. Clark exhibited some beau- 

 tiful opaque objects, including a section of chalcedony, showing cinna- 

 bar and metallic mercury ; silver crystals (artificial), gold crystals (na- 

 tive), a Cliff' House sponge, gold crystals (artificial), and a gorgeous 

 insect, Corythuca hyalina. M. E. Jaffa showed a series of slides, ex- 

 hibiting the germs of lactic, acetic, and vinous fermentation. 



Dr. Herzstein showed several preparations of pathogenic bacteria, 

 including Gonococcus in pus, a pure culture of Streptococcus and Sta- 

 phylococcus Pyogenes aureus, in pus. These were all shown with an 

 apochromatic immersion lens, an apochromatic condenser, and com- 

 pensating eye-pieces, giving a beautiful image. Charles C. Riedy 

 showed the circulation in the tail of the stickleback and several diatoms 

 mounted in iodide of mercury, the latter with an amplification of i ,000 

 diameters. 



George O. ^litchell had an attractive exhibit, consisting of various 

 chemical crystals shown with polarized light. The list included Aspa- 



