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MSS. intended for publication and books, etc., intended for review should be sent to The Editor of Science, Garrison-onHudson, N. Y. A GEOMETRIC BASIS FOR PHYSICAL AND ORGANIC PHENOMENA THE following uotes refer to certaini ideas which the writer has had in mind for many years, but in the form inow submitted they are immediately suggested by a recent casual examination of D'Arey W. Thompson's " Growth anid Forimi" (Cambridge Unliversity Press, 1917) and particularly by reading certain naragrapbs in this book relating to the various po-sible divisions of space by systems of surfaces or material films and membranies, in coinnection with a discussion of the internal structure of organic bodies. A number of years ago the present writer submitted a brief paper to the American Physical Society under the title "A simple geometrical priniciple and its possible signlificance in connection with a general physical theory." The principle was stated as follows: "In any aggregation of an indefinite number of equal spherical bodies an arrangeme-nt giving mninimum total volume occupied and perfect symmetry throughout is imnpossible." The quotations are from memory. An abstract of the paper was published at the time in the Physical Review. Of course this principle mlight be dealt with by geometrical construction and mathematical analysis, but it can be demonstrated experimentally and in a simple and practical way by nmeans of a number of balls of equal diameter like the hollow celluloid "ping-pong" balls, or the rubber balls sold as children's playthings. Thiek mucilage, varnish, collodion. sealing wax or any other available adhesive substance may be used for sticking the balls together. Perhaps what follows may seem at first too elemeintary to be regarded as something of real scientific interest, but it is a inatter of some surprise to find how many erroneous and confused ideas on so simple a o n A pr il 13 , 2 01 7

A Geometric Basis for Physical and Organic Phenomena