Report on the Bacteriology of Water. 



2 ( .)7 



the observations. The scale consisted of fifty divisions, and I started 

 with the septum at and the tip at 14. The following table gives 

 the positions of this septum and tip at successive intervals as (1) the 

 growth of the terminal segment carried tip and septum further apart, 

 and (2) the elongation of the rest of the filament as a whole pushed 

 the entire segment forward over the scale. 



It will be noticed that to do this I observed the successive periods 

 during which the filament pushed the septum over five divisions, as 

 I found that the easiest plan, and then recorded the position of 

 the tip at the time (see fig. 26). 



Fia. 26. 



* i.e., I brought the septum back again so as to lie under the division on the scak-. 

 VOL. LVI1I. T 



