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TWO:Still more important than these observations themselves is the great truth he derives from them��since rediscovered and worked out in detail by Von Baer��that in the development of each individual the generic characters make their appearance before the specific characters.211 Nor is this a mere accidental or isolated remark, but, as we shall show in the next chapter, intimately connected with one of the philosopher��s metaphysical theories. Although not an evolutionist, he has made other contributions to biology, the importance of which has been first realised in the light of the evolution theory. Thus he notices the antagonism between individuation and reproduction;212 the connexion of increased size with increased vitality;213 the connexion of greater mobility,214 and of greater intelligence,215 with increased complexity of structure; the physiological division of labour in the higher animals;216 the formation of heterogeneous organs out of homogeneous tissues;217 the tendency towards greater centralisation in the higher organisms218��a remark connected with his two great anatomical discoveries, the central position of the heart in the vascular system, and the possession of a backbone by all red-blooded animals;219 the resemblance of animal intelligence to a rudimentary human intelligence, especially as manifested in children;220 and, finally, he attempts to trace a continuous series of gradations connecting the inorganic with the organic world, plants with animals, and the lower animals with man.221 TWO: TWO:This fine large village, actually a suburb of Li��ge, was quite deserted, not a living being was to be seen. I entered shops and caf��s, called at the top of my voice, but got no reply anywhere. I was inclined to believe that everybody had fled. And they would have been quite right too, for huge columns of smoke rose up from the heights around the place, four or five in a row, after a booming and rolling peal like thunder had seemed to rend the sky. TWO:"You shall leave it tomorrow, never to return," Bruce declared.The latter seems a plausible theory, and perhaps a correct one; but there are two facts in connection with the operation of reaction water-wheels which seem to controvert the latter and favour the first theory, namely, that reaction wheels in actual practice seldom utilise more than forty per cent. of useful effect from the water, and that their speed may exceed the initial velocity of the water. With this the subject is left as one for argument or investigation on the part of the reader.