446 TRANSACTIONS OF SECTION B. 
ticular view. It would have been easier to speculate first and then to test the 
speculations, but the opposite course was purposely adopted. 
Fleck, in addition to confirming the chemical nature of several of the chemi- 
cally better known members by careful fractionation methods, had by the 
beginning of this year succeeded in determining the chemical nature of nine 
members which had not previously been elucidated. All except two of these 
fo) w (=) 
ie) t+ 
a N cu 
tu a 
a 
ud 4 <0 = 
ro) fra =< < 
< <x = oc 
ai oc ” =) 
> ee Ea: 
wo oO 
< Ease 
—! Ps Lae 
»25a8e 
o Fot=a7 
Q r= <> 
OF Fares 
=| oi 2es : 
Lo Frese & 
oe cee re) = 
al bd nm Ww > 
Se) Zoek: oOo. — = 
=) th ae a Ww = 
r= =) = 5 
< uw tJ hae c 
” = y = 
> 
kK 43 
= ra 
= =) 
LJ 
eal 
Li 
{ 
=) 
& 
<< 
[ea 
POLONIUM 
BISMUTH 
- RAY (OR RAYLESS) 
CHANGE 
6 
3 RELATIVE ne OF NEGATIVE ELECTRONS 
” 
= 
THALLIUM 
SSVW OIWOLY JO SLINN 
Cu 
were in the series subsequent to the zero or emanation group, of which members 
only the two longest lived—polonium and_radio-lead—had previously been 
chemically characterised. At this time A. 8S. Russell,? who knew of Fleck’s 
results, put forward the view that in the B-ray change the position of the element 
in the periodic table changes by one place, and he was the first to publish a com- 
3 Chem. News, January 31, 1913, 107, 49. 
