. The biology of insects. Insects -- Biology. Fig. 81.—Tail-end of Springtail (Achorutes longispimis) Spitsbergen. a, normal two-spined specimen; b, three-spined variety. X 300. further distinctive characters would be necessary and the creatures possessing them would need to '* breed ; In the course of the early controversies that raged during the last century around the evolution problem, it was often urged by opponents of Darwin that incipient species could never be established, as they would be " swamped by ; The segregation brought about through Mendelian
. The biology of insects. Insects -- Biology. Fig. 81.—Tail-end of Springtail (Achorutes longispimis) Spitsbergen. a, normal two-spined specimen; b, three-spined variety. X 300. further distinctive characters would be necessary and the creatures possessing them would need to '* breed ; In the course of the early controversies that raged during the last century around the evolution problem, it was often urged by opponents of Darwin that incipient species could never be established, as they would be " swamped by ; The segregation brought about through Mendelian inheritance disposes of this objection, and in the case of various insects—Amphidasys and Drosophila, for example—already used in illustration, we see how the new form is preserved in a pure strain. Such a result may be regarded as a kind of germinal isolation ; the importance of various types of isolation in the fixation of systematic differences was emphasised by G. J. Romanes (1897), and as. 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 Carpenter, George H. (George Herbert), 1865-1939. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyorkthemacmilla
