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Pure water is simply oxygen and hydrogen, eight-ninths being oxygen and but one-ninth hydrogen; the latter gas, if pure, having, like oxygen, neither taste nor smell. This mode being for obvious reasons impracticable, cisterns are made, and rain conducted to them through pipes leading from the roof.

In the furnace were the products of the previous combustion and atmospheric air: consequently oxygen, nitrogen, carbonic acid, and aqueous vapor. If even one of these gases was self-luminous, the field of vision must have been always illuminated.

Chemistry, that royal queen of all the sciences, answers readily: 'Water is but the combination of two gases, oxygen and hydrogen, and in the proportion of eight to one. In other words, in order to form water, take eight parts of oxygen and one of hydrogen, mix them together, and the result or product is water.

The more oxygen these last globules have at their disposal during their formation, the more vigorous, transparent, and turgescent, and, as a consequence of this last quality, the more active they are in decomposing sugar. We shall hereafter revert to these facts. In the airless flask the proportion of yeast to sugar was 1/59; it was only 1/79 in the flask which had air at first.

The alkaloids, that most important class from a medical and pharmaceutical point of view, have until quite recently been defined in the books simply as "vegetable bases, containing nitrogen." Whether they were marsh-gas or benzol derivatives was not made out; how the four elements, carbon, hydrogen, oxygen, and nitrogen, were grouped together in them was absolutely a thing unknown.

It is immersed in water or air; or it is contained within a parent organism. Wherever placed, however, its outer and inner parts stand differently related to surrounding existences nutriment, oxygen, and the various stimuli. But this is not all.

It is usual to state the proportions of air as being 1 Oxygen to 4 Nitrogen. It is a curious fact, that, while there are six varieties of compounds of nitrogen and oxygen, but one of these is fitted to sustain life, and that is our atmosphere.

All our water and food is there, and the emergency oxygen tanks. "Now let's take the stairway to the upper deck." The upper deck was the main living quarters. There were several small rooms on each side of the corridor down the center; at the extreme nose was the control room, and at the extreme stern was the observatory.

In relation to the first, it has been suggested that if consciousness be regarded as dependent upon a certain rate of atomic vibration, it is possible that this rate depends on a store of intramolecular oxygen, which, owing to fatigue, may become exhausted; or it may be supposed that alkaloidal substances may collect as fatigue products within the brain, and choke the activity of that organ.

Warm elastic wristlets and anklets would save many a feeble person from increasing decay or disease. When the circulation is feeble from debility or disease, the union of carbon and oxygen in the capillaries is slower than in health, and therefore care should be taken to preserve the heat thus generated by warm clothing and protection from cold draughts.