442 



Dr. E. Frankland. On the Conditions [Mar. 21, 



DIAGRAM No. 1. 



IB 91 1093 'O94 



May.Jun.JI}Aii&Stp Ocf Hu OK Jtn Feb. flit Apri^JwJ.Jfy Aufr Sep Ocf Hx OetJan_FebMar.AplM3} Jun Jly Ant Sep OaNov Dec 



en ooo 

 tt.ooo 

 zi.ooo 

 i oooo 



/SOOO 

 / 0,000 

 17,000 

 16,000 

 15,000 

 14,000 

 13,000 

 12,000 

 11,000 

 10.000 

 9,000 

 0,000 

 7,000 



000 

 5,000 

 4,000 



3,000 



a.ooo 

 1,000 



number of microbes per cubic centimetre with the temperature of 

 the water at the time the samples were taken. In this diagram the 

 ordinates express the numbers of microbes and the temperatures, 

 whilst the abscissae denote the months when the samples were taken. 

 For obvious reasons the ordinates expressing numbers of microbes 

 *ind temperature are numbered in opposite directions. 



From this table and diagram, high temperature would appear to 

 have been unfavourable to microbes in May, June, July, August, and 

 September, 1892, when the number per cubic centimetre was small; but 

 in October and November the number still remained small, although 

 the temperature in these months was much lower. In December, 

 however, of the same year the temperature remained much the same 

 -as in November, but the microbes underwent an enormous increase. 

 Again, in the following year (1893), the temperature in January on 

 the day when the sample was collected was still lower, being at the 

 freezing point, but the microbes were considerably less numerous. 

 On the other hand, in February, when the temperature was higher, 



