Names of the Gasses. Weight of a Weight of a cubical inch. cubical foot. (A) qrs. oz. dr. qrs. Atmospheric air .32112 1 1 15 Azotic gas .30064 1 0 39.5 Oxygen gas .34211 1 1 51 Hydrogen gas .02394 0 0 41.26 Carbonic acid gas .44108 1 4 41 (B) Nitrous gas .37000 1 2 39 Ammoniacal gas .18515 0 5 19.73 Sulphurous acid gas .71580 2 4 38 [Note A: These five were ascertained by Mr Lavoisier himself.--E.] [Note B: The last three are inserted by Mr Lavoisier upon the authority of Mr Kirwan.--E.] No. VII. _Tables_ _of the Specific Gravities of different bodies._ Sec. 1. _Metallic Substances._ GOLD. Pure gold of 24 carats melted but not hammered 19.2581 The same hammered 19.3617 Gold of the Parisian standard, 22 carats fine, not hammered(A) 17.4863 The same hammered 17.5894 Gold of the standard of French coin, 21-22/32 carats fine, not hammered 17.4022 The same coined 17.6474 Gold of the French trinket standard, 20 carats fine, not hammered 15.7090 The same hammered 15.7746 [Note A: The same with Sterling.] SILVER. Pure or virgin silver, 24 deniers, not hammered 10.4743 The same hammered 10.5107 Silver of the Paris standard, 11 deniers 10 grains fine, not hammered(B) 10.1752 The same hammered 10.3765 Silver, standard of French coin, 10 deniers 21 grains fine, not hammered 10.0476 The same coined 10.4077 [Note B: This is 10 grs. finer than Sterling.] PLATINA. Crude platina in grains 15.6017 The same, after being treated with muriatic acid 16.7521 Purified platina, not hammered 19.5000 The same hammered 20.3366 The same drawn into wire 21.0417 The same passed through rollers 22.0690 COPPER AND BRASS. Copper, not hammered 7.7880 The same wire drawn 8.8785 Brass, not hammered 8.3958 The same wire drawn 8.5441 IRON AND STEEL.