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![The Biological Action of Growth Substances. Symposia of the Society for Experimental Biology, No. XI. H. K. Porter, Ed. Academic Press, New York; Cambridge University Press, London, 1957. viii + 344 pp. $9.50. | Science The Biological Action of Growth Substances. Symposia of the Society for Experimental Biology, No. XI. H. K. Porter, Ed. Academic Press, New York; Cambridge University Press, London, 1957. viii + 344 pp. $9.50. | Science](https://www.science.org/cms/10.1126/science.127.3310.1335.b/asset/d2ad3a6a-6139-4537-b11c-8d3b58d9b8cf/assets/science.127.3310.1335.b.fp.png)