Letter | Published:

Graphical Representation of Growth Gradients

Nature volume 154, pages 611612 (11 November 1944) | Download Citation



GROWTH gradients in animals have been represented by a method described by Huxley1, based on growth constants, that is, the values of α in the allometry formula2, y = bxa. Huxley1 has discussed the inadequacy of his graphical method and the formal difficulties of devising a better, but no attempt seems to have been made to overcome these difficulties. It is thought that the simple mathematical considerations below constitute a solution to the formal obstacles in the way of the quantitatively accurate representation of certain types of growth gradient. The gradients referred to here are gradients in heterauxesis3 in which the growth intensities are in the direction of the axis along which the gradient lies. Multiplicative growth in length only is discussed, but similar concepts apply to multiplicative growth in area, volume and weight.

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  1. 1.

    "Problems of Relative Growth" (London, 1932).

  2. 2.

    , and , Nature, 137, 780 (1936).

  3. 3.

    , , and , Nature, 148, 225 (1941).

  4. 4.

    Arch. Entw. Mech., 129, 402 (1933).

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  1. Squires Cottage, Crawley Down. Sept. 20.

    • P. S. HEWLETT


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