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Contemporary correspondence is invoked to provide further information concerning the decision of the Cavendish Society to publish an English translation of Gmelin's Handbuch der Chemie in 1846, and the opposition this provoked.

Various aspects of the integrability of dynamical systems are discussed with the help of the singular point analysis. In particular the connection with the Painlevé property is described. Several examples will serve as illustrations.

Effort is then well-nigh indescribable. Not wholly so, else it would be meaningless. Description is a matter of degree: who can fully describe red or wet? To be sure, description comes down in the end to the pointing to certain given qualities or relations or events which are just there. All connotation rests on denotation, though it may be something more. But the unique positive thing about effort is its originality; to which indeed we can point, since every one experiences (...) it in himself. Yet common to all men though it is, it is so intangible! more spirit than body, more force than substance. We should perhaps best call it not a datum but a factum, or better still, a fiat, a doing rather than a deed, yet not merely a becoming, for we see things coming to be, we hear a melody progressing and touch a moving object. Effort, dynamic as it is, is not just the process, rather it is--we must re-iterate--the start, the initiative of the process. Nor is the experience of it properly called mystical. Even if mystical experience were indescribable, as has been wrongly alleged, these would be two quite different indescribables, the one receptive, the other originative. All we can say perhaps is that effort is analogous to the push that starts the ball rolling, not the motion of the ball, not the acceleration, but the enforcement of these. Its witness does not lie in its value as explanation of the motion; the witness is direct, the immediate experience which every man has. It seems to be no object of scientific investigation in the technical sense. It cannot be measured by itself, as acceleration and motion are measured. That is why physics has abandoned the old notion of force, the physical analogue of effort, replacing it by mass-acceleration. That is why the rationalists in modern philosophy look askance at this direct experience of man, so intangible that we can draw from it no logical implications. For it has no structure. Its characteristic is not clearness nor distinctness. We might be tempted to say it is like a point in space, too small to be envisaged, yet not a zero; but it is more like a dot or spark, so small as to be just seen, so small as to have no visible spread, no content that we can analyze to draw out rational consequences connecting it with other things. Here too we see why the contemplative thinker seldom believes in free choice, which the natural man naturally accepts. Free choice is the kind of thing that might well belong to this experience; free choice is origination. Not necessarily that all effort is freely made. The baby exercises no free choice when he sucks hard at the nipple, nor the adult when he wrestles for his life with an enemy. But they want, need, desire; that is the point. Desire--that is the essence of effort. Desire has the originative quality; it comes as it were out of one's self and from no other source, it is what we want, our self insisting on its own. But the business is so deep within that it is easily overlooked, or deliberately excluded from the gaze, and without a qualm. We might say it is too near to be noticed, or too deep down to obtrude itself, as the water in the well is easy to see, but not the spring at the bottom of the well. Effort disappears from the scene when the thinker is calmly gazing; but when he acts it is felt, and strongly felt. It is in fact the very essence of the self, the well-spring of its worth and its growth. A man is what he does. His worth lies in what he makes. All that he is responsible for, all that he earns, is credited with, or guilty of, comes from this innermost source. So thinks the practical man, so we all believe when we are conducting our lives in intercourse with one another and with nature. But for the contemplative attitude there is here too little of clear articulation, of object-matter for analysis; no use can be made of it in a deductive system. So the system-builders discard it. (shrink)