Abstract
This paper was prepared by invitation for the Second International Congress of the International Association for Testing Materials which was held in London, April 19-24, 1937.
The first part comprises the prepared report which was sent to all members before the meeting of the Congress. The praiseworthy instructions to authors required the compression of the assigned subject into a concise, factual report. The papers were not read at the Congress sessions. Instead, each author was given five minutes to comment on the significance of the reported facts.
The second part consists, therefore, of my comments when this paper was called up for discussion at the session of Group C on Organic Materials on April 21. It draws attention to the far-reaching and fundamental significance of the facts reviewed in the formal report.
The paper and comments together with discussion from the floor will appear in the forthcoming "Congress Rook." My indebtedness to the International Association for Testing Materials is hereby gratefully acknowledged for permission to print the paper and comments in full prior to publication in the "Congress Book."
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