504 Mr. T. Tate's Experimental Researches on the 



In order to compare the absorbing powers of Afferent absorb- 

 ents, let / and f be put for the velocities corresponding to the 

 same time T of ascent of the liquid on two different absorbents, 

 then we get from equation (2), 



/=— i_ 



* 2 */«(T-p)' 



••/~V «(T+p) 



and neglecting p and p', we get 



/- A A'. 



7-VJT' 



(9) 



(10) 



that is, in this case the absorbing power varies inversely as the 

 square root of a, or inversely as the square root of the time which 

 the liquid takes to ascend one inch. 



Now taking the absorbing power of the unsized paper of 

 Exp. I. as unity, we find from equation (10), 



The absorbing power of the calico in the above experiment 



= v/i-i= 1,63 ' 



that is to say, the absorbing power of the calico is 1*63 times 

 that of the unsized paper. 



In this manner the powers of different absorbents may be defi- 

 nitely expressed. 



These formulae also give us the relative diffusibility of differ- 

 ent liquids in any given absorbent. 



Experiment VIII. 



The liquid used in this experiment was turpentine, and the 

 absorbents were unsized paper and calico. The temperature was 

 55° throughout the experiment. 



A. Unsized paper of Experiment I. 



B. Calico of Experiment VII. 



