acta. 
= ey : 
94 Mr Watson, Some Experiments on the 
The first set of figures, which is not reproduced in full for the : 
lower pressures, was obtained from an experiment with a sample of 
gas which was originally very pure, but which had been pumped 
into a test tube and allowed to stand a few days before use. Even 
Helium Neon 
p Vi wa p V y’ 
56°3 387 616 32°8 | 267 a2 
48-7 oD 568 De 251 350 
38°8 343 505 24-0 | 243 O27 
31-7 322 455 17:9 228 299 
DY 304 414 13-2 | 219 203 
20-6 293 385 99:3 215 261 
14:4 20 351 = — — 
11:8 GAS a 8335 2°81 204+ 241 
9-1 BAD | BBL 1:28 216 2314 
6°75 227 | 309 10-1§ 200 240, 
5:34 21 985) 7:98 200 240 
4:44 PAQSY Ui USAT Il 5-76 203 240 
3°18 188 | 245 || 4-49 200 240. 
2:45 186 QD, hii 2°65 200 232 
2°43 Weg, ila | 2-19 200 230 
1 87 SIO ey Wa) 204 224. 
1:86 USO BOG Il 123 218 224 
1:31 216 evenness | 0:96 240 229 
Woy) 221 (198 | 1-878 211 228 
1-:09« 249 210 1-43 Daley 229 
0-79« BO) | DEO) 1On 242 235 
0:69% >1000 258 0-77 285 232 
0-495« 309 0:59 358 231 
0475+ 332 0-45 450 246 
0-44 360 || 0-345 1725 | 290 
0:355« A) i 0-27 1790 360 
0-262. 750 | 0-21 >1000 435 
0-16 | 650 
0-125 9830 
+ Minimum value. § Fresh gas. 
though all the apparatus and the test tube had been previously 
well rinsed with the gas, it is likely that some impurity was 
introduced, as the minimum values for V were 204 and 231 
respectively, those obtained later with purer gas being 200 and 
224. By analogy with helium, however, it is probable that the 
