172-184). Proceedings of the Ninth [N.S., XVIII, 
ber of long a atoms of charge +e to be expected as a result of colli- 
sions with bombarding a particles of ois og +2e assuming the nuclii act 
as — charges eso the inverse squa 
number observed e su petomctally eee not agree with Darwin’s 
editlation 8. It is opp greater than theory indicates. There are three 
neni ssible explanatio 
cee er (i) the ass aes charges +e and + 2e are wrong. 
Or (ii) the nucliido not act as point charges rere as eee of finite 
size, 
(iii) the law of force is wrong at these small distanc 
If a particles . ses range (4 cms.) and smaller pia are used 
— Darwin law fo mber is much more nearly obeyed. Thus in these 
ases both Deiie! 8 econo as to the charges and the force-law must 
riage correct or very nearly so 
n other words when ‘the approach of the nuclii is nut so close the 
charges and the law of force are correct and the nuclii act as points. 
en 3 
cles (range 7) the most likely solution is not that the law of force itself 
suddenly alters ae that the nuclii no longer act as point charges at dis- 
tances os 10- > ems, 
— Sua, wn by Ruthe ae that the FL ae Sohuvere 
an PA BE Bia ie mat — swift H particles as produced equally well trots 
combined hydro 
_. Additional eontie cn that these swift atoms are really hydrogen 
with a + charge has been obtained by the measurement of their mass and 
velocity by the deflection method. : 
y are found to be atoms of 
charge +1 
mass | relative to oxygen (mass 16) 
and the value for te 
ma 

=10# e.m. units. The electrolytic value of 
charge 
—— for H, is 9570 e.m.u, Hence the atoms are undoubtedly hydro- 
gon of oh charge +1 which means that t they are probably by droge nuclii. 
h e 
electron, « or proton with purely mor magnetic mass. If this is true it is 
easy to ——o its diameter since its mass and char rge are kno 
“ and m are the masses of nu oe ot. pease ieee 
respectively, tes being purely electro-magneti r their re spec: Ze 
tive radii. Then since they have the same shai e fe eae 
hes @ 
3M pm Ser 
g oe =_—.P => = =] a ms. 
2 & wr’ raga * 13% 10 c 
3 
’ Thus on this hypothesis ina radius of the H'atom nucleus is 5,55 Of 
the radius of the ne egative elec 
S$ extreme minuteness is ete out as we have seen by all the 
deflection gehen 
mee the Helium nucleus (a particles) has nearly four times the mass 
of the H nucleus it ie "faters ed that the former porns four positive 
eta ts nuclei) and two negative electrons — iated very closely. 
oa charge is +2e. Since in radioac transformations, a 
rticles are peeidey but never H atoms, it is pele inferred that the 
ga <a aati a i i 1 


