Letter | Published:

Shape of Sea-Urchins

Nature volume 154, pages 675676 (25 November 1944) | Download Citation

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Abstract

IN the latest edition of "Growth and Form" (1942), Sir D'Arcy Thompson has directed attention to the analogy between the shapes of drops of such a liquid as ortho-toluidine when resting on the bottom of a vessel filled with water, and the shapes of sea-urchins. Thus a small drop remains practically spherical while a large drop spreads itself out, or more or less sags under its own weight (pp. 946–48).

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  1. The Laboratory, Citadel Hill, Plymouth. Sept. 28.

    • A. G. LOWNDES

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DOI

https://doi.org/10.1038/154675b0

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