1898.] on Some Becent Besults of Physico-Chemical Inquiry. 653 



liquids to temperature has engaged the attention of many physicists 

 from the time of Poiseuille, but, on the whole, no empirical formula 

 reproduces the observed values better than that of Slotte, which may 

 be written in the shape — 



rj = C/{a + ty\ 



In order to determine the value of the constants two values of 

 7], viz., rji and 773, are chosen, which correspond respectively with the 

 temperatures t^ and ^3 ; a third value of 77, viz. r}2, is then found from 

 the equation rj^ = v' rj^ rj^, ^^^ ^^^ temperature t^ corresponding with 

 this value 770 is found graphically, and a and n are deduced from 

 the equation — 



1 2 - t t^ 



i i n = 



log 771 - lonf 7)3 



log (a + ^3) - log (a + <i)- 



Writing the formula in the shape -q = C / (1 -{- h i)", where C is 

 the viscosity coefficient at 0°, the experimental results in the case 

 of the whole series of liquids may be accurately represented by 

 formulae of the Slotte type by means of the following constants. 



Constants in Slotte's Formula, 77 = C/(l + h 0"- 



