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We get our oxygen from it, however, we touch it incessantly, now in this part, now in that, and every time we touch it we are reflected back into the water with our course re- determined and re-energized. The abstract ideas of which the air consists, indispensable for life, but irrespirable by themselves, as it were, and only active in their re-directing function.

If not, its contact with the oxygen of the earth's atmosphere will produce an aërial conflagration which, if it does not roast alive every living thing on earth, will convert the oxygen, by combustion, into an irrespirable and poisonous gas, and so kill us by a slower, but no less fatal, process." "Horrible!" she said, shivering this time.

May the ghosts of the men who mar the earth, turning her sweet rivers into channels of filth, and her living air into irrespirable vapours and pestilences, haunt the desolations they have made, until they loathe the work of their hands, and turn from themselves with a divine repudiation.

=Hydrochloric Acid Gas.= Irrespirable when concentrated, and very irritating when diluted. Very destructive to vegetable life. =Chlorine.= Used in bleaching, and as a disinfectant. Greenish-yellow colour, suffocating odour. In poisoning, inhalation of sulphuretted hydrogen gives relief.

A solution of one part in 2000 will destroy microscopic organisms. Two teaspoonfuls of this substance will make a solution strong enough to kill all disease germs. The burning of sulphur produces sulphurous acid, which is an irrespirable gas.

II. Organic. Neuronic. Sedative or depressant. Excito-motory or convulsives nux vomica, strychnine. Vulnerants powdered glass. III. Asphyxiants. Poisonous and irrespirable gases. It may be inferred that poison has been taken from consideration of the following factors: Symptoms and post-mortem appearances, experiments on animals, chemical analysis, and the conduct of suspected persons.

Those who had secured the shelter offered by the solitary marquee and who, notwithstanding the irrespirable and filthy atmosphere, considered possible suffocation and the danger of fire to be preferable to the drenching rain, were confronted with a new and far more terrifying menace.

The air by night, whether damp or dry, is equally pure, equally salubrious with the air by day, and calls not less solicitously for ceaseless admission into our dwellings. Air, ere it reaches the lungs, is always damp. Quite dry air is irrespirable. It needs no peculiar or unusual habitude in order to respire what is termed night air.