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Arabs, fertility of crosses with other races; gashing of cheeks and temples among the. Arachnida. Arakhan, artificial widening of the forehead by the natives of. Arboricola, young of. Archeopteryx. Arctiidae, coloration of the. Ardea asha, rufescens, and coerulea, change of colour in. Ardea coerulea, breeding in immature plumage. Ardea gularis, change of plumage in.
Even the wide interval between birds and reptiles has been shown by the naturalist just quoted to be partially bridged over in the most unexpected manner, on the one hand, by the ostrich and extinct Archeopteryx, and on the other hand by the Compsognathus, one of the Dinosaurians that group which includes the most gigantic of all terrestrial reptiles.
Not long ago, palaeontologists maintained that the whole class of birds came suddenly into existence during the eocene period; but now we know, on the authority of Professor Owen, that a bird certainly lived during the deposition of the upper greensand; and still more recently, that strange bird, the Archeopteryx, with a long lizard-like tail, bearing a pair of feathers on each joint, and with its wings furnished with two free claws, has been discovered in the oolitic slates of Solenhofen.
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