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Reed and his associates proceeded to extend their experiments for the purpose of establishing the fact in such a positive manner that the medical profession and the scientific world generally might be convinced of the reliability of the experimental evidence upon which their conclusions were based. The mosquito serves as the intermediate host for the parasite of yellow fever.

This brings us to a second characteristic of philosophical propositions, namely, that they must be a priori. A philosophical proposition must be such as can be neither proved nor disproved by empirical evidence. Too often we find in philosophical books arguments based upon the course of history, or the convolutions of the brain, or the eyes of shell-fish.

Love, to be really love, and not merely a transitory desire, never clings to the perishable, but is awakened and kindled by, and based upon, the eternal only. Man is not even able to love himself unless he consider himself as eternal; moreover, he cannot even esteem and approve himself.

It is precisely the same as Haeckel’s, although he is opposed to Haeckel in regard to the strictly Darwinian standpoint. The Theory of Descent has conquered, and it may be said with assurance, for ever. That is the firm conviction on which the whole work is based, and it is really rather treated as a self-evident axiom than as a statement to be proved. Weismann takes little trouble to prove it.

It is a premature, tired, sickly, fuddle-headed heaven. Imagination about other people based upon imagination about what one wants oneself, is the manly, unfooled, clean-cut energy that rules the world.

The only way to give finality to the world is to give it consciousness. For where there is no consciousness there is no finality, finality presupposing a purpose. And, as we shall see, faith in God is based simply upon the vital need of giving finality to existence, of making it answer to a purpose.

You cannot make yourselves glad by, as it were, laying hold of yourselves and lifting yourselves into gladness, but you can rule the direction of your thoughts, and so can bring around you summer in the midst of winter, by steadily contemplating the facts and they are present facts, though we talk about them collectively as 'the future' the facts on which all Christian gladness ought to be based.

Mill and Maurice, from totally alien points of view, have shown up the preposterous nature of the notion. " A good deal of what you have thought is, I fancy, based on a strange forgetfulness of your former experience.

Surely there is an abundance of clever advertisement writers at work, and great establishments make some careful tests before they throw their millions of circulars before the public. Yet even their so-called tests have in no way scientific character. They are simply based on watching the success in practical life, and the success is gained by instinct.

It suggested a knowledge and an ability not based upon insight into principles, but expressing the result of a large number of separate trials. It expressed the idea now conveyed by "method of trial and error," with especial emphasis upon the more or less accidental character of the trials.