118 TRANSACTIONS OF THE 
MOLECULAR REALITY. 
By H. FLETCHER. 
(Abstract). 
A short review of the history of the kinetic theory. 
A summary of the equations used in determining mol- 
ecular magnitudes. Description of Brownian movements in 
gases. Calculation of the average displacement due to 
Brownian movements: (1) Along a line; (2) In a plane; 
(3) In space. Calculation of the actual displacement and 
time of fall when an outside force is acting. Development 
of formulae which give the distribution of the displace- 
ments about the mean value. Description of recent experi- 
ments and presentation of data which completely verify 
the theoretical formulae. Calculation of all of the molecu- 
lar magnitudes from the data. Verification of the fact 
that a gaseous ion and an ion taking part in electrolysis is 
the same. 
