Report on the Bacteriology of Water. 413 



At 11.30 a rod bent thus \ was selected and measured as fol- 

 lows : The total measurement is given, and the behaviour of the 

 segments into which (as commonly at high temperatures) the filament 

 broke up are referred to later. 



This filament was an interesting one in several respects, for its 

 segments broke off so conveniently, or remained joined at such con- 

 venient angles, that I was able to measure them much more accurately 

 than sometimes occurs. 



When first observed, the filament consisted of two segments joined 



at an angle of about \ . At 12 noon the horizontal leg had broken 



into two rods, the ends of which were already sliding one over the 



other, thus \ , and by 12.20 the other leg had bent into two 



segments, which remained joined thus 



Consequently, I was able to measure all four segments separately, 

 and, for convenience, I term them A, B, breaking up into a, 6, and 

 c, d, as shown in the diagram. The following are their measure- 

 ments, the intervals occupied in these were too small to record. 



First, I take the whole of the leg B, A and the whole of the leg 

 C, D, and give their measurements separately, then their separate 



segments from the time they became distinct. 







Total Length. 



(From 11.30 A.M. to 1 P.M.) 

 Doubling periods : 



1. 42-75 85'5 p. = 11.30 A.M 12.0 noon = 30 minutes at 31 ! 30 '76 C. 



2. 85 -5 171 -0 = 12.0 noon 12.36 P.M. = 36 30 '75 30 '831 C. 



Or, calculated back : 



270135 -0 /x = 12.25 P.M. 1.0 P.M. = 35 minutes at 3131 '25 C. 

 135_ 67-5,, = 11.52A.M. 12.25 =33 31 80 '75 31 C. 



Normal doubling period : 

 42 -7585 -5 /* = 11.30 A.M. 12.0 noon = 30 minutes at 31 -130-75 C. 



Segment A. 

 (Comprising, after 12 noon, 6 and a.) 



Doubling periods: 



1. 22 -5 45 ft = 11.30 A.M. 12.0 noon = 30 minute* at 31-130-75 0. 



2. 45-090 - 12.0 noon 12.28 P.M. = 38 30-7531 C. 



