. The study of animal life. Zoology. 332 The Study of Animal Life part iv interesting to learn that colour r blindness has been known to occur in the males only of six successive generations, deaf mutism for three, finger malformations for six, and so with harelip and cleft palate, and with tendencies to con- sumption, cancer, gout, rheumatism, bleeding, and so on. But these facts do not prove the transmission of functional or environmental variations ; they only corroborate what every one allows, that innate, congenital, constitutional characters. Fig. 70.—Half-lop rabbit, an abnormal variati
. The study of animal life. Zoology. 332 The Study of Animal Life part iv interesting to learn that colour r blindness has been known to occur in the males only of six successive generations, deaf mutism for three, finger malformations for six, and so with harelip and cleft palate, and with tendencies to con- sumption, cancer, gout, rheumatism, bleeding, and so on. But these facts do not prove the transmission of functional or environmental variations ; they only corroborate what every one allows, that innate, congenital, constitutional characters. Fig. 70.—Half-lop rabbit, an abnormal variation, which by artificial selection has become constant in a breed. (From Darwin.) tend to be transmitted. Yet some cases recently stated by Prof. Bertram Windle seem to suggest that some patho- logical conditions acquired by function may be transmitted. But even if a non-constitutional pathological state acquired by a parent reappeared in the offspring, we require to show that the offspring did not also acquire it by his work or from conditions of life, as his parent did before him. (3) Some individual cases seem to stand some criticism. Two botanists, Hoffmann and Detmer, have noted such facts as the following—scant nutrition influenced the flowers of poppy, Nigella, dead-nettle, and the result was trans-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thomson, J. Arthur (John Arthur), 1861-1933. New York, C. Scribner's sons [printed at the Edinburgh press]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1892
