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11). In the Snapdragon of our gardens there is sometimes to be seen a fifth stamen (staminode) which does not produce pollen, besides the four fertile ones, and in Figwort, a related plant, this is the normal thing. MAN OWL F I G . 13. T h e third eyelid (nictitating m e m b r a n e ) of an o w l compared with the plica semilunaris o f m a n . (Redrawn from Beadnell's ** Picture B o o k of Evolution," W a t t s . ) Evidence from the Geographical Distribution of Plants and Animals. The distribution of plants and animals over the surface of the world is in its broad outlines well known ; and several groups of facts emerge which can be interpreted adequately b y the theory that the different species have come into existence b y the slow process of evolution from pre-existing forms, but which cannot be accounted for in any satisfactory manner b y the theory of Special Creation.

Then, amongst these survivors, locally distinct changes t o o k place, resulting in the three cedar types we k n o w n o w . Evidences from Embryology. In studying the development of plants and animals from the fertilised egg to the adult stage, biologists have discovered surprising facts, which, in the absence of the theory of evolution would be unintelligible and meaningless. The embryo of a three-day-old chick, for example, bears no resemblance at all t o a bird, and possesses structures which are not t o be found in the adult stage, 40 SOCIAL BIOLOGY and which were o f no value in the embryo stage.

D i d Mr. Dawson himself set out on this hoax? Or was he himself originally fooled b y some other person? Dawson died in 1916 and it is not n o w possible t o distinguish absolutely between these alternatives, although careful reading o f modern evidence is likely to sway many opinions t o the view that Dawson did indeed do these fakes himself. Certainly the fakes were extremely clever. Pekin Man is interesting because there is evidence that he already knew the use of fire ; and from the considerable number of tops of skulls found without the association of corresponding skeletons, it is inferred that he collected skulls.

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