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      On the manner of development of man from some lower form
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      Chapter

      On the manner of development of man from some lower form

      DOI link for On the manner of development of man from some lower form

      On the manner of development of man from some lower form book

      On the manner of development of man from some lower form

      DOI link for On the manner of development of man from some lower form

      On the manner of development of man from some lower form book

      ByPaul H Barrett
      BookThe Works of Charles Darwin: v. 21: Descent of Man, and Selection in Relation to Sex (, with an Essay by T.H. Huxley)

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      Edition 1st Edition
      First Published 1992
      Imprint Routledge
      Pages 39
      eBook ISBN 9781315476650
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      ABSTRACT

      It is manifest that man is now subject to much variability. No two individuals of the same race are quite alike. We may compare millions of faces, and each will be distinct. There is an equally great amount of diversity in the proportions and dimensions of the various parts of the body; the length of the legs being one of the most variable points.' Although in some quarters of the world an elongated skull, and in other quarters a short skull prevails, yet there is great diversity of shape even within the limits of the same race, as with the aborigines of America and South Australia - the latter a race 'probably as pure and homogeneous in blood, customs, and language as any in existence' - and even with the inhabitants of so confined an area as the Sandwich Islands. 2 An eminent dentist assures me that there is nearly as much diversity in the teeth as in the features. The chief arteries so frequently run in abnormal courses, that it has been found useful for surgical purposes to calculate from 1 ,040 corpses how often each course

      prevails.3 The muscles are eminently variable: thus those of the foot were found by Professor Turner4 not to be strictly alike in any two out of fifty bodies; and in some the deviations were considerable. I He adds, that the power of performing the appropriate movements must have been modified in accordance with the several deviations. Mr J. Wood has recorded5 the occurrence of 295 muscular variations in thirty-six subjects, and in another set of the same number no less than 558 variations, those occurring on both sides of the body being only reckoned as one. In the last set, not one body out of the thirty-six was 'found totally wanting in departures from the standard descriptions of the muscular system given in anatomical text books'. A single body presented the extraordinary number of twenty-five distinct abnormalities. The same muscle sometimes varies in many ways: thus Professor Macalister describes6 no less than twenty distinct variations in the palmaris accessorius.

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