Report on the Bacteriology of Water. 



449 



piece of empty sheath 8'5 p. In fact, the disjointing segment 6 had 

 contracted away in its sheath from the parent filament 7. During the 

 next five minutes the bit of sheath disappeared, and the rodlet began 

 growing again as an independent segment. 



Now, it is perfectly feasible to measure all these portions of the 

 original filament, only, of course, it takes two or three minutes to 

 accomplish the necessary movements of the culture to bring the 

 various segments at angles under the scale and to turn the eye- 

 piece and read off the measurements. Consequently, one has to 

 record the mean time of measurement, and a corresponding slight 

 lack of accuracy results in the curves. 



At o.l, i.e., eleven minutes after the last record, the various seg- 

 ments were grouped as in the following diagram : 





And measured as follows : 



a! = 48" 25 fi having grown 3'25 

 ft' = 108-0 fi 6-75 , 



7 = 180-0 n 27-0 t 

 t> = 18-0 a 4-0 



Total. . 354-25 



41-0 



The mean time of the next record was 5'10, and the position was 

 as in the annexed diagram : 



