This series of three photographs by T. H. West, which appears on the following pages, won 3rd Prize in Techniques in the Photomicrography Section of the 1973 ASTM Photographic Exhibit (see story in November 1978 JTE). Mr. West works in the Research Department of Imperial Oils Enterprises Ltd., P.O. Box 3022, Sarnia, Ontario, Canada N7T 7M1. Information on entering the 1974 Photographic Exhibit is given on p. 125.