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ON RADIATION.
lowing table were examined, a small portion only of each being admitted into the glass tube. The quantity admitted was just sufficient to depress a column of mercury associated with the tube one inch: in other words, the gases were examined at a pressure of one-thirtieth of an atmosphere. The numbers in the table express the relative amounts of wave motion absorbed by the respective gases, the quantity intercepted by atmospheric air being taken as unity.
Radiation through gases.
| Name of gas. | Relative absorption. | |
| Air | 1 | |
| Oxygen | 1 | |
| Nitrogen | 1 | |
| Hydrogen | 1 | |
| Carbonic oxide | 750 | |
| Carbonic acid | 972 | |
| Hydrochloric acid | 1005 | |
| Nitric oxide | 1590 | |
| Nitrous oxide | 1860 | |
| Sulphide of hydrogen | 2100 | |
| Ammonia | 5460 | |
| Olefiant gas | 6030 | |
| Sulphurous acid | 6480 | |
