. Evolution and disease . , affect other digits ;thus in fig. 61 a chick is represented with two bifidtoes and partial duplicity of the left leg. Birds withthese accessory parts may live and attain the adultcondition. Supernumerary legs are very common in birds, indeed. Fig. 61.—A Chick with two dichotomized digitsand a supernumerary leg. almost every poultry breeder has seen examples, yetaccessory wings are very rare. One specimen only isknown to me, a dove, preserved in the museum of theRoyal College of Surgeons (fig. 62). This bird has anaccessory wing growing from the lower part of thester
. Evolution and disease . , affect other digits ;thus in fig. 61 a chick is represented with two bifidtoes and partial duplicity of the left leg. Birds withthese accessory parts may live and attain the adultcondition. Supernumerary legs are very common in birds, indeed. Fig. 61.—A Chick with two dichotomized digitsand a supernumerary leg. almost every poultry breeder has seen examples, yetaccessory wings are very rare. One specimen only isknown to me, a dove, preserved in the museum of theRoyal College of Surgeons (fig. 62). This bird has anaccessory wing growing from the lower part of thesternum, 9 114 EVOLUTION AND DISEASE. The apparent rarity of supernumerary fore limbs, incomparison with hind limbs, will be dealt with whenconsidering the question of dichotomy as manifested inthe trunk. In cats and dogs dichotomy of the terminal segmentsof the fore and hind-limbs is fairly often seen, and afive-legged dog is one of the usual exhibits at a penny
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectabnormalitieshuman
