380 ME. P. 0. PEDERSEN ON THE SURFACE-TENSION OF LIQUIDS 



TABLE XII. Distilled Water. 

 Tested about two days after the distillation. 



put = 0-99913, = -0-151. 



TABLE XIII. Distilled Water. 

 Tested about one year after the distillation. In the meantime kept in a corked vessel. 



= 0-99913, 



= -0-151. 



That the results are almost the same for the three kinds of water is not surprising, 

 as DUPR* and Lord IlAYLEiGHf have shown that even very considerable impurities 



* DUPR&, ' ThtSorie mecanique de la chaleur,' p. 376, Paris, 1869. 



t RAYI.EIGH, ' Roy. Soc. Proc.,' 47, p. 281, 1890 (' Papers III.,' p. 340). 



