300 ACETIC FERMENTATION 



none but long rods are found, some of these being already disconnected, others 

 still retaining the chain form. The latter also finally become dismembered, so 

 that after a further four hours none but elongated cells, 40 p. and more in length, 

 are present. These now continue to grow, and in twenty -four hours from the 

 commencement of the experiment long threads (Fig. 85), some of them measuring 

 200 ft in length, are found exclusively. 



A fresh modification of form sets in as soon as these long threads are exposed 

 to the original temperature of 34 C. they begin to bulge. These forms (Fig. 86) 



FIG. 86. Bacterium Pasteurianum. 



Conversion of long threads into swollen (bulged) forms and chains. Culture in " doppel-bier " at 34 C. 

 J. condition after four hours ; II. after five hours ; III. after seven hours. Magn. 1000. (After 

 Jiannen.) 



can be already noticed at the end of four hours, and their number rapidly in- 

 creases from that time onward. At about the same time other portions of the 

 threads begin to break up into fragments, the disruption beginning indifferently 

 at either or both extremities, or in the middle of the thread, which is thus 

 modified into a chain of short rods, or one exhibiting both long rods, unaltered 

 portions of threads, and bulged articulations ; in short, great diversity prevails. 

 All intermediate stages of the last-named forms, between the very frequent 

 spindle cells on the one hand, and pear-shaped rounded forms on the other, are 



