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THREE:In planing and turning, the tools require no exact form; they can be roughly made, except the edge, and even this, in most cases, is shaped by the eye. Such tools are maintained at a trifling expense, and the destruction of an edge is a matter of no consequence. The form, temper, and strength can be continually adapted to the varying conditions of the work and the hardness of material. The line of division between planing and milling is fixed by two circumstances��the hardness and uniformity of the material to be cut, and the importance of duplication. Brass, clean iron, soft steel, or any homogeneous metal not hard enough to cause risk to the tools, can be milled at less expense than planed, provided there is enough work of a uniform character to justify the expense of milling tools. Cutting the teeth of wheels is an example where milling is profitable, but not to the extent generally supposed. In the manufacture of small arms, sewing machines, clocks, and especially watches, where there is a constant and exact duplication of parts, milling is indispensable. Such manufactures are in some cases founded on milling operations, as will be pointed out in another chapter."Kill him," she said in a hoarse whisper that thrilled Hetty. "That is a sure and easy way out of the peril. We can prove that he left the house, nobody can prove that he ever returned. I have my jewels back; there is nothing that we can be traced by. And the secret dies with him." FORE:We have said that Protagoras was a partisan of Nomos, or convention, against Nature. That was the conservative side of his character. Still, Nomos was not with him what it had been with the older Greeks, an immutable tradition indistinguishable from physical law. It was a human creation, and represented the outcome of inherited experience, admitting always of change for the better. Hence the vast importance which he attributed to education. This, no doubt, was magnifying his own office, for the training of youth was his profession. But, unquestionably, the feelings of his more liberal contemporaries went with him. A generation before, Pindar had spoken scornfully of intellectual culture as a vain attempt to make up for the absence of genius which the gods alone could give. Yet Pindar himself was always careful to dwell on the services rendered by professional trainers to the93 victorious athletes whose praises he sang, and there was really no reason why genius and culture should be permanently dissociated. A Themistocles might decide offhand on the questions brought before him; a Pericles, dealing with much more complex interests, already needed a more careful preparation.