MICROPHYTES FOUND IN THE BLOOD. 397 



hope of being able to supply facsimile copies of some of them 

 with this paper. I fear, however, that it will not be practicable 

 to obtain reproductions of the negatives by any of the permanent 

 photographic processes practised in Europe in sufficient time to 

 permit of their publication at present. I have therefore caused 

 tracings of some of the leading forms to be made and have had 

 them engraved on wood (fig, 17).^ 



Fig. 17. — Spirilla in the blood of fever i)atients in Bombay ; traced from 

 micro-photographs taken with Ross' ^y immersion objective. Some 

 of the longer si)irilla in the woodcut are in the micro-photographs seen 

 to consist of two fibrils loosely attached at the ends. This peculiarity 

 cannot be reproduced in the engraving. Several of the blood- 

 corpuscles present a stellate appearance. 



In the last number of Cohn's 'Beitriige' (Band II, Heft 3), 

 Dr. Koch has supplied some excellent micro-photographs of the 

 spirilla as observed at St. Petersburg. The spirilla in the osmic- 

 acid preparation which I possess, though presenting the same 

 general characters as those in Dr. Koch's photographs, are some- 

 what thicker than those depicted in the latter ; whether this 

 points to any slight difference in the blood between the fever 

 which prevailed in Bombay last year and the fever which pre- 

 vailed in St. Petersburg I am not prepared to say, but this 

 much, I think, I may venture to state, namely, that the differ- 

 ence between the spirilla in the preparation in my possession 

 and those received from St. Petersburg, as photographed by Dr. 

 Koch, or the spirilla sketched by Weigert (fig. 15), is as great 

 as the difference which exists between the Sjnrillum Ober- 

 meieri and the Sjnrilliim plicatilei on the one hand, and the 

 Sjnrillum of the mouth on the other. As has already been 

 seen, these differences are exceedingly trivial, and it is quite 

 possible that such slight differences may exist in these microphytes 

 in different persons during the same epidemic, and at different 



' Two of these micro- photographs will be found reproduced as permanent 

 photographs, by the Autotype Company, in the original memoir. 



