. The study of animal life. Zoology. 314 The Study of A nimal Life part iv to advantageous white. Not a few animals vary slightly with the changing seasons. Thus many cases are known where a butterfly produces in a year more than one brood,. Fig. 67.—Seasonal dimorphism of Papilio ajax; to tlie left the winter form (variety TeiaTnonides), to the right the summer form (variety Marcellus). (From Chambers's Encyclop.; after Weismann.) of which the winter forms are so different from those born in summer that they have often been described as different species. It is possible that this is a reminis
. The study of animal life. Zoology. 314 The Study of A nimal Life part iv to advantageous white. Not a few animals vary slightly with the changing seasons. Thus many cases are known where a butterfly produces in a year more than one brood,. Fig. 67.—Seasonal dimorphism of Papilio ajax; to tlie left the winter form (variety TeiaTnonides), to the right the summer form (variety Marcellus). (From Chambers's Encyclop.; after Weismann.) of which the winter forms are so different from those born in summer that they have often been described as different species. It is possible that this is a reminiscence of past climatic changes, such as those of the Ice Ages, as the. 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
