56 



Transactions ok the Canadian Institute. 



[Vol. IX. 



Careful comparison of the results recorded in columns 2 and 3 will 

 show that the conductivity of the colloid bears a very direct relation to 

 the amount of chlorine in the solution : for this reason we may illustrate 

 the relation between the velocity of the particles and the amount of 

 chlorine in the colloid by examining the relation between the velocity and 

 the resistance. At any rate the measurements of the resistance are much 

 more reliable than the chemical analyses for such extremely small portions 

 of chloride as we would be dealing with in the later samples. 



The curve in Figure i represents the relation between the velocity 

 of the particles in the diluted samples of the colloid and the resistance 

 of the undiluted sample taken at the same time. We notice at once the 

 curious result that, as the chlorine is removed from the liquid the velocity 



/oo 



XOO 300 400 



soo 



600 



700 



SOO 900 

 Reststdnce Iflr^'' 



of the particles at first increases, reaches a maximum, and then gradually 

 decreases. As far as the dialysis was carried there is not an indication 

 that the velocity of the particles would soon reach a zero value. 



Although we cannot say from these results that the particle owes its 

 charge entirely to the chlorine present, we see that the charge is affected 



