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operties. The way in which the combination is effected is a mystery, yet we do not account for the new and peculiar properties of water (so different from those of the original gases) as arising from a principle of "aquosity," which we have to invoke from another world. The answer is that the argument is from analogy, and that there is not really the remotest analogy between the two cases. It is true that, as far as we know, electricity is necessary to force a combination of the requisite equivalents of oxygen and hydrogen into water. But though we do not know why this is, or what electricity is, we can repeat the process as often as we will. But mark the difference; the water once existing is obviously only a new form of matter, in the same category with the gases it came from: it neither increases in bulk, nor takes in fresh elements to grow, and give birth to new drops of water. But protoplasm has something quite different--for there may be dead protoplasm and living protoplasm, both identical to the eye and to every chemical test. In either condition, protoplasm, as such, has _properties_ of the same nature (though not of the same kind) as those of water, oxygen gas, or any other matter; it is colorless, heavy, sticky, elastic, and so forth; but besides all that (without the aid of electricity or any physical force we can apply) one has the power of producing more protoplasm--gathering for itself, by virtue of its inherent power, the materials for growth and reproduction. If directly water was called into existence it could take in nourishment, and divide and go on producing more water--and if some water could do this, while other water (which no available test could distinguish from it in any other respect) could not, then we _should_ be perfectly justified in giving a special name to this power, and calling it "aquosity" or "vitality" or anything else, it being out of all analogy to anything else which we call a "property" of matter. In the introduction of LIFE into the _aeon_ of organic developmental history, we have a clear and distinct period, as we had when _matter_ came into view, or when _the change_ was ushered in which set the cosmic gas cooling and liquefying, and turning to solid in various form. The fact is that every organic form, whether plant or animal, derived from the protoplasmic compounds of carbon-dixoide, ammonia and water, is, as Mr. Drummond puts it,[1] "made of materials which have once
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