62 



THE DIFFUSION OF CASKS THROUGH 



It will be seen that the new march of volumes in the lapse of time is 

 essentially curvilinear throughout the whole interval of examination of 

 37 days. Only at the end, abruptly, a nearly constant rate appears which 

 is abnormally low. The initial constants are roughly 



i'o = o.o225 c.c./day, or lo k= 1.43 



and the final constants 



z'o = 0.0072 c.c./da}-, or io'^/c = o.46 



Thus the mica support has not changed the erratic behavior in the flotation 

 in this vessel, in which the constants have fallen in about 90 days from 



10 K = 3.4, an enormously high value, to 10 a. = 0.46, an abnormally low 

 value, as compared with the usual residtof about io^^k — 0.9. All attempt 

 to interpret this exceptional record has remained futile, but it induced us 

 to discard the double-tube apparatus in most of the experiments below, as 

 being not only much more difficult to manipulate, but (for some occult 

 reason) liable to be untrustworthy in its indications, even after long lapses 

 of time within which equilibrium conditions would certainly have appeared. 



41, 



Diffusion of Air into Air Through Water; Further Experiments. — 



The peculiar behavior of air in the diffusions 

 of §39 made it necessary to install a series 

 of further experiments in which the dimen- 

 sions of the swimmer were 





C 



Sepm(H5 .. - ... 



suitably varied. The 



double-tube apparatus //, 

 after the work for which 

 it was destined had been 

 completed, was also ad- 

 justed for air diffusion. In addi- 

 tion to this, there are results for 

 the diffusion of air through water 

 to be made in connection with 

 each of the vessels in which air is 

 to diffuse through solutions, in 

 order that suitable standards may 



Fig. 19, A, B. c.-Chart showing loss of stand- '"^ every case be available. ^ 

 ard volumes of gas in diver in lapse of days. In tables 18 and 19 two similar 

 Diffusion of air through water. ^-^.^j.^ ^^^^.^ introduced into a 



single-tube apparatus. They were both made exceptionally long, \^ ith a small 

 head //' and large diffusion column h"-\-2h"', the swimmers being 11 to 12 

 cm. in length. The effect of this would naturally be to increase the solution 

 discrepancy. One diver was somewhat heavier than the other, the masses 

 being about 15 and 23.5 grams, respectively. Finding that the diffusion 

 progressed with exceptional slowness but quite identically (see figs. 19 a 

 and b) in character in the two vessels, the light diver was now cut down to 



