452 C. CLIFFORD DOr.ELT,. 



to have its ends covered with little dark caps — an appearance 

 seen in many stained Bacteria. 



During the division of an organism into two, the nucleus 

 behaves in a characteristic manner. It lies, before division, 

 tOAvards the centre of the cell (fig. 130). Whilst in this 

 positioi), it divides into two daughter-nuclei, with the forma- 

 tion of a minute dumb-bell figure (figs. 125, 126). lliese 

 daughter-nuclei then separate to a variable distance from one 

 another (fig. 127) and cytoplasmic fission follows (figs. 128, 

 129). According to the degree of separation which has 

 occurred between the daughter-nuclei, the nuclei of the 

 daughter-cells may lie in a terminal (fig. 129) or centi'al 

 (fig. 128) position. 



The general appearance of the nucleus in this Spirillum 

 — both during rest, and during division — is therefore closely 

 similar to that of the nucleus which I have already described 

 in Micrococci and Sarcina. 



4. "FusiFoKM Bactehia." 



At various times, I have encountered a cumber of organisms 

 belonging to the group of so-called "fusiform Bacteria." 

 These organisms are very commonly found in the intestines 

 of animals. I have studied their structure in quite a number 

 of forms, and all appear to be organised in essentially the 

 same manner. 



My own impression — after observing many different organ- 

 isms of this class — is that they are really not Bacteria at all, 

 but more probably belong to the Fungi. Perhaps they are 

 related to the yeasts. But as I have no conclusive evidence 

 — from their life-histories — of their real affinities, and as they 

 are usually regarded as Bacteria, I will describe here the 

 forms which I have investigated. 



(a) "Fusiform Bacteria" from Lacerta muralis. 



I found fusiform organisms fairly common in the large iutes- 

 tines of the lizard which 1 captui-ed near Naples. '^J'he}' were 



