THE STKUOl'UKE OF THE NUCLEUS. 



35 



show this, and to show also that the slopes, h, are diflfereiit, being .08, .14, and .10, 

 respectively. The mean of the^^e values, if a double weight be given to the first, is 

 b = .1, and as this agrees with the independent experiments made with the di'uni 

 below, § 24, and marked n in figure 5, it will be taken. In fact, a correction of 

 tal)le 4 is here chiefly aimed at, and it is thus not necessary to insist on accurate 

 values of h. In succeeding chaptei's, however, h will be used to estimate the velocity 

 of the nucleus, and it must then be called to mind that an order of values is alone 

 foreshadowed. 



If now the value of ^iu table 4 be corrected in accordance with 



iV=10^^'+^"^'°^-^ 



wherein case of isothermal exhaustion y/ = . 764, /= i.fi minutes, I'/rrr.l, the data of table 

 7 result, giving the number of particles iV, corres|)onding to the successive coronas. 



TABLE 7— VALUES OF N\ = 10^''+^"^"^^ 



b — .10 



t = 1.6 min. 



For adiabatic conditions, since ?/ = {p/'P^Y'^, if Y 

 for identical t and I the values, N^, of table 8 result. 



1.4, y = .825. Hence 



TABLE 8.— VALUES OF N^ - 10 ^<"+'"'»'°8-^ 



y = {p/p»y''' = -825 



/' = .10 



/ =7 1.6 min. 



15. 



Glohe eocperknevis repeated.— In the above experiments, § 14, the time 

 between exhaustions was only appi'oximately determined and its impoi'tance was 

 not at that time apprehended. Hence in the following cases, tables 9-12, the time 

 record is continuous. A variation is also made in the nucleation. The first two 

 tables hold for punk nuclei, the thiixl for sulphui- nuclei emanating from the flame, 

 the last for phosphorus nuclei supplied by a small i)ellet and therefore weak. In 

 o-eneral all the series terminate when the coronas are normal and about double 



