then the quotient will be the number of cubic feet
per pound of the same. If we divide the combining weight of any of the
substances given in the table by 2, then the quotient will give the
density of the same, as compared with hydrogen. If we divide the combining
weight of any of the substances by the constant 28.87, then the quotient
will be the specific gravity of the gas or vapor therefrom, as compared
with air. All the calculations are based on the atomic weights which are
now generally adopted by the majority of chemists.

-------------------------------------------------------------------
| | |Cub. Ft.| |
| | | per | |
| Combi- |Cub. Ft.| Combi- |Specific|
| ning | per | ning |Gravity |
|Weight. | Pound. |Weight. |Air = 1.|
------------------------------+--------+--------+--------+--------|
Hydrogen (H_{2}) | 2.00 | 188.53 | 377.07 | 0.0692 |
Carbon vapour (C_{2}) | 23.94 | 15.75 | 377.07 | 0.8292 |
Nitrogen (N_{2}) | 28.06 | 13.43 | 377.07 | 0.9719 |
Oxygen (O_{2}) | 31.92 | 11.81 | 377.07 | 1.1056 |
Chlorine (Cl_{2}) | 71.00 | 5.31 | 377.07 | 2.4593 |
Bromine (Br_{2}) | 160.00 | 2.35 | 377.07 | 5.5420 |
Flourine (F_{2}) | 38.00 | 9.92 | 377.07 | 1.3162 |
Iodine (I_{2}) | 253.20 | 1.48 | 377.07 | 8.7703 |
Sulphur (S_{2}) | 63.96 | 5.89 | 377.07 | 2.2154 |
Phosphorus (P_{4}) | 123.84 | 3.04 | 377.07 | 4.2895 |
Carbonic oxide (CO) | 27.03 | 13.50 | 377.07 | 0.9674 |
Carbonic acid (CO_{2}) | 48.89 | 8.59 | 377.07 | 1.5202 |
Water vapour (H_{2}O) | 17.06 | 20.99 | 377.07 | 0.6221 |
Hydrogen sulphide (H_{2}S) | 33.08 | 11.09 | 377.07 | 1.1770 |
Ammonia (H_{2}N) | 17.03 | 22.14 | 377.07 | 0.5898 |
Sulphurous oxide (SO_{2}) | 63.90 | 5.90 | 377.07 | 2.2133 |
Sulphuric oxide (SO_{3}) | 79.86 | 4.72 | 377.07 | 2.7662 |
Cyanogen (C_{2}N_{2}) | 52.00 | 7.25 | 377.07 | 1.8011 |
Bisulphide of carbon (CS_{2}) | 75.93 | 4.96 | 377.07 | 2.6300 |
Ethyl alcohol (C_{2}H_{6}O) | 45.90 | 8.21 | 377.07 | 1.5898 |
Ethyl ether (C_{4}H_{10}O) | 73.84 | 5.10 | 377.07 | 2.5576 |
Methyl alcohol (CH_{4}O)