INVESTIGATED BV THE METHOD OF .IET VIBRATION. 



379 



RESULTS. 



Water. 



1 4. For the determination of the surface-tension of water I have made three series 

 of measurements, the results of which are shown in the Tables XL, XII., and XIII. 

 The first table refers to ordinary tap- water, and gives a mean value 



T, = 74-33 dyne/cm. 



The secoml tahle is for freshly distilled water, and gives 



T, = 74-31 dyne/cm. 



The third table is for distilled water that has been kept for about a year in a 

 stoppered Iwttle : the result is 



T, = 74-23 dyne/cm. 



The greatest value found is in experiment No. 44 (Table XIII.) : 



T lft = 74-80 dyne/cm. 

 The least is in experiment No. 41 (Table XIII.), namely : 



T lft = 73-40 dyne/cm. 



The greatest deviation in the 18 experiments recorded in the Tables XI. -XIII. is 

 thus about 1'9 per cent. 



TABLE XI. Ordinary Tap- Water. 



irp 



p lb!4 = 0-99913, '- = -O'lol. 



3 c 2 



