W. A. Norton—Force of Effective Molecular Action. 485 
of the process of combination, that the reduction in the size of 
the effective molecules, would be attended with an increase in the 
ratio k, and a consequent increase in the value of the attractive 
term in equation (1), for the same value of z (or graphically, 
a rise of the curve of effective molecular action; see fig. 3 
118r+-62r ee Fe cine ee f : 
libr+y °. This gives y/=42-257, and radius of mole 
cule=21-127. The distance between the centers of contiguous 
molecules will be 157:25r. In this equation 118r is the dis- 
tance between contiguous molecules of oxygen or hydrogen be- 
fore condensation, and answers to &=2, nearly ; and 627 is the 
diameter of one of the molecules (see page 436): 115r is the 
distance between the same molecules after the condensation into 
aqueous vapor; when & has been increased to 4-931. 
t 
greater or less distance. To obtain the entire impulsive action 
(P) on the point considered, we have then only to conceive a 
hemisphere traced around this point, and that all the points of 
