156 Cathode Disintegration at Low Pressures. 
TasLe [V.—Disintegration in Hydrogen. 
| 
p | V | y | p | V | y ie 
(mg. Hg). | (Volts). (mg.x10—7). | (mm. He). (Volts). |(mg.x 10-7). 
Gold. 
Copper. 
0°55 1020 | 112 
0°53 1060 144 O55...| 1250 | 81 
0-41 1330 | 126 054 | 1420 | 57 
0-44 1520 142 (0:39 ee es, 52 
0-3 1800 191 
Silver. | Nickel. 
5 (1307 Se Gai Le aa 
He | 1300. | 19: Qal i>, DOr 1220 20 
Od oh pitti, a 95 0-44 1670 23 
0°42 1470 | 124 He Oaks | 1810 22 
0 44 | 1660 143 | 0-40 | 1930 8 
0-42 1680 142 | | 
Platinum. | | Iridium. 
053 1280 2 elt ale Ea 1100 18 
O45 | 1480 BE (2 89 1660 19 
039 | 1890 3 0:36 1700 15 
O37 1930 92 | 036 2000 18 
ers 2090 74 | 
Palladium 4 | Rhodium. 
0-52 1110 38 | ' | 
0°46 1350 48 0:46 1140 16 
0:36 1840 | AT Hi}, }:0°36 1770 13 
O87} Or ios0 86 | 0°36 1960 | 9 
0:30 2200" | 2 | 
gold, silver, copper, and nickel on the tube-walls now 
appeared in the colours of the pure metals without oxide. 
In the case of the platinum metals the deposit was in part 
black, especially in the cases of iridium and rhodium. But 
it is quite possible that these metals in a finely divided 
condition would give this colour. 
On the assumption that the disintegration in air is caused 
by oxidation *, it seems quite possible to suppose that the 
somewhat irregular disintegration in hydrogen, which is 
* The discovery of E. Goldstein (Ber. d. Deutsch. Chem. Ges. xxxvi. 
p- 3042, 1903) that the oxygen is practically all transformed into ozone 
during the discharge, is of interest in this connexion. 
