l894-] NEW-YORK MICROSCOPICAL SOCIETY. 23 



OBJECTS EXHIBITED. 



1. Diatoms from Croton water in November, 40 forms: by 



H. G. PiFFARD. 



2. Living specimens of Ophryolegna sp., from human urinary 

 tract : by H. G. Piffard. 



3. Tv/o photomicrographs of the same : by H. G. Piffard. 



4. Diatoms from '' Queen Silver Polish": by H. G. Piffard. 



5. Amphiprora conspicua, var. pulchra Van Heurck, and other 

 forms, from Harlem River : by J. D. Hyatt. 



6. Diatoms from Honey Meadow Brook, Dutchess Co., N. Y.: 

 by J. D. Hyatt. 



7. Diatoms from ** Silver Polish,^^ under a William Wales -^-^ : 

 by J. D. Hyatt. 



8. A fruiting fungus on a photographic film : by J. L. 

 Zabriskie. 



9. Section of lung of dog, injected : by Frank Abbott, Jr. 



10. Section of kidney of cat, injected : by Frank Abbott, Jr. 



11. Spirillujn undzila : by Frank Abbott, Jr. 



12. Anthrax bacillus in liver of rabbit : by Frank Abbott, 



Jr. 



Of his exhibit Ophryolegna, Dr. Piffard said that these ciliated 

 infusoria had been preserved alive for ten days in distilled water, 

 and were now exhibited in the same medium ; they were fur- 

 nished by Dr. F. Tilden Brown, of this city, who obtained them 

 from the discharges of the urinary passages of one of his 

 patients ; that they had been submitted to Dr. Alfred C. Stokes, 

 who determined them as an undescribed species of the genus 

 Ophryolegna Ehrb. ; and with regard to the photomicrographs of 

 these organisms, that they illustrate the remarks of Dr. Julien 

 at the last meeting respecting the difficulty of mounting deli- 

 cate organisms without distortion. These photomicrographs 

 show distortion of two kinds — after slow and rapid death. 



Dr. Brown, present at the meeting, said that these organisms 

 are found when shreds are cast in pus-laden urine ; the shreds 

 come probably from a more remote source than the urethra ; 

 the organisms resist the action of slightly acid urine ; and that 

 he and Dr. Piffard both saw what they took to be conjugation 

 in some of these organisms. 



Mr. Hyatt said of his exhibits of diatoms that this Amphi- 



