Dr. A. V. Crehore on 

 Table I. 



Positive charge. Mass. 



2e 1-008 



Ze 7/3 



U .'. 4* 



5e 6* 



6e 9* 



These numbers proceed almost but not quite in accord- 

 ance with the squares of the charge on the supposition 

 that a charge of plus e, if it has any existence, would be 

 one quarter of 1*008, or 0*252. To follow this rule exactly 

 would result in the fractional numbers, 1*008, 2'26S, 4*032, 

 6*300, and 9*072. The fractions have arbitrarily been 

 dropped in each instance except in the cases of 2e and 3e, 

 which latter is retained as 2'333 instead of 2'268. The 

 numbers on the models of fig. 1 represent the number of 

 units of charge cf a positive individual, which in each 

 instance is contained within a volume too small to see in 

 a model, and located in between two electrons in an obscured 

 position, as in the diagram of hydrogen referred to. 



To consider the various atoms in detail, helinm is repre- 

 sented as a pile of four negative electrons bound together 

 by a single positive charge of 4<? located between the central 

 pair of electrons. The nucleus of this atom may be con- 

 sidered to be the alpha particle, consisting of a single 

 positive charge of four units with two negative electrons in 

 contact with it, the two outside electrons of the He-atom 

 being those that become detached during radiation. This 

 is much the same as Rutherford's form for helium, except 

 that he makes the positive charge four hydrogen positive 

 charges, or four hydrogen ions so-called, which would have 

 a mass of 4*032 instead of 4, unless they each differ from 

 their value in hydrogen. Another important exception is 

 that the two outside electrons are supposed to be situated 

 a long distance away from the centre of the atom by 

 Rutherford, though what it is that holds them in such 

 positions is somewhat of a mystery. A still more important 

 difference is that here a definite shape and location is 

 assigned to each of the charges making up the atom. The 

 major diameter of the negative electron, calculated in the 

 first paper, is 



2a = 6*514 xlO" 13 cm. 



and the minor diameter 



2b = 2-130 xlO" 13 cm., 



