THREE:The terrified little sister was unable to stammer anything more, and in great fear suddenly closed the little shutter again."Now, listen to me," he said hoarsely. "I came here to kill you; I came here to be avenged on my brother's murderer. When you saw me come in you were afraid."

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THREE:"Directly Bruce told his story," he went on presently, "I knew exactly what had happened. I knew all about the motor car also. Then it was time for me to act. I was using the house as a kind of trap for you one night when Mr. Charlton appeared. He was good enough to pardon the liberty we had taken and to tell us his story. Then I began to see my way pretty clear. It was I who caused you to be informed about the missing diamonds being still in the well. I had found out that you were in desperate need of money. Isidore let me into that, also through him I got to know Maitrank. You came for the diamonds, but you did not get the real ones, for the simple reason that I had already been down the well and got them for myself. They were simply and plainly set, so that I had no trouble in getting paste imitations.It might have been expected that, on reaching physiology, the Stagirite would stand on firmer ground than any of his contemporaries. Such, however, is not the case. As already observed, his achievements belong entirely to the dominion of anatomy and descriptive zoology. The whole internal economy of the animal body is, according to him, designed for the purpose of creating and moderating the vital heat;315 and in apportioning their functions to the different organs he is entirely dominated by this fundamental error. It was a common notion among the Greeks, suggested by sufficiently obvious considerations, that the brain is the seat of the psychic activities. These, however, Aristotle transports to the heart, which, in his system, not only propels the blood through the body, but is also the source of heat, the common centre where the different special sensations meet to be compared, and the organ of imagination and of passion. The sole function of the brain is to cool down the blood��a purpose which the lungs also subserve. Some persons believe that air is a kind of food, and is inhaled in order to feed the internal fire; but their theory would involve the absurd consequence that all animals breathe, for all have some heat. Anaxagoras and Diogenes did, indeed, make that assertion, and the latter even went so far as to say that fish breathe with their gills, absorbing the air held in solution by the water passed through them��a misapprehension, says Aristotle, which arose from not having studied the final cause of respiration.201 His physiological theory of generation is equally unfortunate. In accordance with his metaphysical system, hereafter to be explained, he distinguishes two elements in the reproductive process, of which one, that contributed by the male, is exclusively formative; and the other, that contributed by the female, exclusively material. The prevalent opinion was evidently, what we know now to be true, that each parent has both a formative and a material share in the composition of the embryo. Again, Aristotle, strangely enough, regards the generative element in both sexes as an unappropriated portion of the animal��s nutriment, the last and most refined product of digestion, and therefore not a portion of the parental system at all; while other biologists, anticipating Mr. Darwin��s theory of pangenesis in a very wonderful manner, taught that the semen is a con316flux of molecules derived from every part of the body, and thus strove to account for the hereditary transmission of individual peculiarities to offspring.202

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