100 Scientific Proceedings, Royal Dublin Society. 
Group I. 
Stable Substances free from Air. 
Up to 180°. Above 180°. ‘tempat 
SUBSTANCE. = 
IN| AS iy | Bs We | &s 
Isopentane, .. ie a3 55 | — 0:007 4 |—0:012) 59 | —0:007 
Normal pentane, .. a 26 |+0°005| 12 |—0-027} 38 ||— 0-065 
Normal hexane, Ou We 17 | + 0-07 15 | +4 0:08 | 32 |+0:°074 
Namie oe | Se TOME > ufone | iy jou 
Normal octane, fae nih 6 ;+ 0:07 13 |4 0-11 | 19 |+0°10 
Di-isopropyl, io ae | 1B SONS 6 |4+0-12 | 19 |—0-07 
Di-isobutyl, ie Wom > jso08 | a6 | 2006 
Hexamethylene, .. are 10 | + 0:03 10 | + 0°05 | 20 + 0°04 
Benzene, a de ae 10 |—0-04 10 |+ 0:01 20 |—0°016 
F luorbenzene, es ue 10 | + 0°02 16 |+ 0:07 26 |+ 0°05 
Chlorobenzene, Me = 5 |+ 0:11 9 |4 0:05 14 | +4 0:07 
Carbon tetrachloride, nie — — 11 |+ 0-06 11 | + 0:06 
Stannic chloride, 4 |+ 0-03 11 |+ 0°08 15 |+0-08 
Methyl formate, | 15 |—0-03 | 10 |)50:02 |) 255)\=ro-ame 
Methyl acetate, a a | 12 0 20 |+ 0°09 Oo e006 
Ethyl acetate, us Be 11 |—0-008} 11 |—0°005) 22 |— 0-006 
Methyl propionate, .. wie | 11 | 40-08 12 |+ 0°12 23 | + 0-10 
Propyl acetate, we sis 9 |-—0-01 12 |+ 0-15 21 | + 0:08 
Ethyl propionate, .. a 9 |+0-01 12 | +0°18 21 |+0:075 
Methyl butyrate, .. ye 9-5 0;09 V2 Oe20 Pk |p OS 
Methyl] isobutyrate, so | LO pak OOH 12 |+0°056|) 22 | + 0-005 
257 |+ 0-009} 286 |+40:069] 493 | + 0-037 
Hydrocarbons only, .. | 152 |—0-001} 88 |+0-047] 240 | + 0-016 
There can be no question about the stability of the hydro- 
carbons; and it will be seen that for the 152 determinations of the 
vapour-pressures of these substances up to 180°, the mean observed 
alteration of pressure with volume is quite negligible; for the 
