. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1844.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL, in some beds, being manifest in its gaseous state. Again, as I have pre- viously observed, air is always present with water, and in its latent state, and consequently when combustion is generated by the intrusion of saline waters in fossil beds, in their primary condition, the alkalis being in their uncombined state, air is liberated in sufficient quantity to sustain the internal fire. It cannot for a moment be contended, tha
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1844.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL, in some beds, being manifest in its gaseous state. Again, as I have pre- viously observed, air is always present with water, and in its latent state, and consequently when combustion is generated by the intrusion of saline waters in fossil beds, in their primary condition, the alkalis being in their uncombined state, air is liberated in sufficient quantity to sustain the internal fire. It cannot for a moment be contended, that spontaneous combustion will not be elicited from mixed bodies buried within the earth, for the artificial volcano distinctly proves that all the phenomena of volcanic action may be truly imitated. The earth is deriving a large and continuous supply of oxygen and azote from the atmospliere, and the phenomena consequent thereon are variously manifest in different regions of the earth : in the vast expanse of deserts in Asia and Africa, the virgin soils greedily imbibe air as well as rains and dews, the oxygen entering into combination with the marine exuvis, the hydrogen uniting with the sulphur, and escaping to the surface as sulphuretted hydrogen. This gas, so inimical to the existence of man, is continually evolved in those parts of the desert which have become covered with rank vegetation: be- tieath the rainless regions the sulphureous gas is principally evolved: on the other hand nitrogen readily unites with the supporters of com- bustion, becomes a component of many earthy bodies, and is a proxi- mate cause of the generation of nitrates. Chlorine freely evolved unites with sulphur and phospliorus and forms an acid, and this acid is again decomposed by the uncombined alkalis, deposited as a weutral body, on or in the surface of the earth, it is the subject of incessant change, separating and recombining as local influences may determine. Chlorine and oxygen are the only g
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