16 Improvemenis in Physical Science [JAN. 
Sp. Gr. | Ditto 
Gaseous Bodies. by caleu- Experimenters. 
exper. | lated. 
DAG ais lerelelnia'=:s/os totewiisiaicteie 1:0000 
Vapour of iodine ............ 8°6195 | Gay-Lussac. Ann, de Chim, 
: xo LT. 
Vapour of hydriodic ether....| 54749 Gay-Lussac. 
Vapour of oil of turpentine ..| 5°0130 Gay-Lussac, 
Hydriodic acid gas ........ .-| 4°4430 | 44288 |Gay-Lussac. Ann. de Chim. 
xci. 16, 
Fluosilicie acid gas .........-| 3°5735 John Davy. Phil. Trans. 1812, 
p. 354. 
BOSS Ene Ssh si ws)neicp ae cos 3°3894 |Id. Ib. p. 150. 
Nitrous acid gas.............- 3-1764 | Gay-Lussac. 
Vapour of sulphuret of carbon) 2°6447 Gay-Lussac, 
Vapour of sulphuric ether... .| 2°5860 Gay-Lussae. 
CHIOTIEN sane nism ios <ieiee ern 2°4700 | 2°4216 | Gay-Lussac and Thenard. 
Buchlorine .........0..+6 athe 2°3144 | Gay-Lussac. 
Pluoboric gas <2... 052.26 2°3709 John Davy. Phil. Trans. 1812, 
p- 366, 
Vapour of muriatic ether ....} 2°219 Thenard, Mem, d’Arceuil, 
Lael, 
Sulphurous acid gas ..........| 2°1930 | 2°2072 | Davy. 
Chloro-cyanic vapour ........ 21113 | Gay-Lussac. Aun. de Chim. 
xev. 210. 
GYANOPeN ecicjoci salssies vicisie s/s 18064 | 18011 |Td. Ib. p. 177. 
Vapour of absolute alcohol ..| 1°6133. | 1-6030 | Gay-Lussac. 
Nitrous oxide....... Pace sete 15204 | 1°5209 | Colin. 
Carboniesacidtic. scien cisite ° aie 1°5196 Biot and Arago. Mem. de 
VInstit. 1806, p. 320. 
Muriatic acid......... ceeeee.| 1°2474 | 1°2505 | Id. Ib. p. 320. 
- Sulphureted hydrogen ........| 1:1912 | 1:1768 | Thenard and Gay-Lussac. Re- 
cherch, Phys.-Chim., i, 191. 
OXyZEN 2... ccecreccscecceese| 1°1036 Biot and Arago. Mem. de 
VInstit. 1806, p. 320. 
Nitrous gas...........sseee0--| 1°0388 | 1:0364 | Berard. 
Olefiant gas........+e-eeeeee-| O'9784 Th. de Saussure. Ann, de 
Chim, Ixxxix. 283, 
AZOLE EE cbse nas oviaeve cess O'909L Arago ‘and Biot. Mem, de 
lInstit. 1806, p. 320. 
Oxide of carbon ...........- 0:9569 | 0°9678 | Cruickshanks, 
Hydro-cyanic vapour ........ 09476 | 0°9360 | Gay-Lussac, Ann, de Chim, 
xev. 150, 
Phosphureted hydrogen ...... 0°S70 Davy. | 
MECAT kw dine sian’ « daisies wielows 0-6235 | 0°6250 | Gay-Lussac, 
Ammonia............. eeee---| O°5967 | 0°5943 | Biot and Arago, Mem. de 
V'Instit, 1806, p. 320. 
Carbureted hydrogen ........ 0°5550 | 0°5624 | Thomsen. 
Arseniated hydrogen.......... 0°5290 Trommsdorf, 
Hydrogen..... oe wasiaee becuse 0:0732 Arago and Biot. Mem. de 
I'Instit, 1806, p. 320. 
4. Relation between the Specific Gravity of Gaseous Bodies and 
the Weights of their Atoms.—\n the Annals, vii. 343, I published 
a short paper on this subject, in which I endeavoured to follow out 
an idea that had been first started by Dr. Prout. I showed that if 
we make the specific gravity of oxygen gas 1, and refer that of all 
2 
