212 Messrs. Mendenhall §■ Ingersoll on Phenomena 
Table I. 
Substance. 
a -So 
Dirrchon ot 
motion 
when molten. 
Motion when 
solid. 
Substance. 
•2 -s 
Direction of 
motion 
when molten. 
Motion when 
solid. 
§ 
Hi 
u 
p 
9 
•■o 
3 
"S 
SP 
.2 
© 
s 
1 
Boron 
Magnesium 
Oxide 
Silicon 
Titanium ... 
Chromium... 
Manganese . 
Iron 
109 
24 
28 
48 
52 
55 
56 
58-7 
58-6 
63-2 
89 
90... 
105 
102 
... 
Mate 
J GI 
+ 
rials o 
ower. 
3 
2 
1 
5 
1 
1 
5 
10 
1 
10 
I 
2 
Rhodium ... 
Palladium... 
Silver 
103 
106 
108 
137 
183 
193 
195 
197 
+ 
+ 
+ 
+ 
+(?) 
+ 
+ 
+ 
+ 
1 
2 
2 
1 
1 
1 
1 
Barium 
Oxide 
Tantalum 
Oxide 
Iridium 
Platinum ... 
Cold 
Oxide 
Cobalt 
Nickel 
Copper 
Yttrium 
"^Zirconium... 
Ruthenium. 
* Zirconium not being, properly speaking, an element, the atomic weight of 
the particular " fraction " contained in the glower is uncertain to about the 
extent indicated in the table. 
for more than a minute or two, and then only very un- 
steadily, especially at low temperatures ; and, secondly, the 
resistance of these oxides is so high that the current cor- 
responding to a given temperature is very much less than 
with the ordinary glower. The circumstances of observation, 
then, are much less favorable, and the effect to be expected 
much less in amount than with ordinary glowers. 
Besides these cases of mass motion we have noted two 
cases of real or apparent diffusion of metal along the glower. 
The first occurs when a particle of metal (gold, platinum, 
and the less oxidizable metals excepted) is heated until it 
melts and fluxes with the glower. In some cases this means 
