This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...long and a quarter as broad in the adult and occupies the middle line of the breast between the fore-legs, not always symmetrically. Rats marked in this manner were found in various parts of India, for example, Madras, Calcutta, Bombay, Poona, Nagpur. The mark may be smaller or larger than usual, it ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...long and a quarter as broad in the adult and occupies the middle line of the breast between the fore-legs, not always symmetrically. Rats marked in this manner were found in various parts of India, for example, Madras, Calcutta, Bombay, Poona, Nagpur. The mark may be smaller or larger than usual, it may be a small spot or a long line two inches in length. If we could obtain some hundreds of individuals marked in this manner we should find, no doubt, that the mark showed fluctuating variation as regards size; but it is evident that the character is appearing independently in places remote from one another and when it appears it is more likely to appear in what may be called the usual amount, than in any other amount greater or less. When the occurrence of this breast mark was first noticed, the fact did not seem to be of much interest. The mark evidently appeared on various occasions, but there was no evidence to show that it was transmissible in full measure from parent to offspring; nor did it seem likely that such a character would appear in every member of a large group so as to constitute a racial mark. Later on, however, evidence was obtained that rats breed true in this respect, and it appears that the mark was made use of as a specific character in the case of the Irish rat Mus hibernicus. At Poona, four young rats were caught together in a trap. AH, being in the same stage of adolescence, were doubtless of the same litter. Each was marked with a white line on the breast. This shows that all the young produced at a birth may be marked in this manner. Such a litter, if placed upon an island, would probably stock it with their descendants, all possessing the mark. We know, however, that it is scarcely possible for such a group to...
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Add this copy of The Growth of Groups in the Animal Kingdom: By R.E. to cart. $38.86, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by Cornell University Library.
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