CONTRIBUTIOXS TO THE CYTOLOGY OF THE BACTERIA. 455 



these double nuclei are artifacts produced by the breaking into 

 two of a single granule through drying. This seems to me 

 improbable, however. 



(d) "Fusiform Bacteria " f rom S tylopyga orientalis. 



The common cockroach harbours a fusiform organism 

 very like those which I have already described. The forms 

 which I have encountered are usually of small size^, and are 

 generally of the double spindle form. 



Every cell contains a nucleus (see fig. 116). It is frequently 

 of a rather square shape, and sometimes I have found nuclei 

 which appear to be dividing (cf. lower nucleus in fig. 116). 

 All the dividing nuclei which I have seen are of this rather 

 curious form — that of two chromatin masses separated by a 

 variable distance. I have not been able to make out any 

 other details of the process of nuclear division, but I have not 

 made a very careful study of these organisms. My only 

 knowledge of them is derived from occasional individuals 

 Avhich I have found in preparations made for other organisms. 



5. On some Nucleated Bacterium-like Organisms. 



In this section I shall describe some curious organisms 

 which present — at certain stages in their lives — a strong 

 resemblance to Bacteria, but which are really to be placed 

 among the Fungi. For a considerable time I believed these 

 organisms to be Bacteria which possessed a typical vesicular 

 nucleus — like that of Bacterium gam man — and I believe 

 that other observers may have fallen into a similar error. I 

 thinkj therefore, that no excuse is needed for publishing my 

 results in some detail in the present paper. 



The organisms under consideration have all been found in 

 the large intestines of animals. I have found them in several 

 insects, snakes, lizards, and Amphibia, and I have also en- 

 countered forms which I believe to be of a similar nature in the 

 rectal contents of mammals. However, I have made no careful 



