PREFACE IX 



133; to Prof. K. D. Erase who contributed the prohferated apple shown 



in Fig. 97; and to Dr. Roger Gauthier for Fig. 49D. He is also deeply 



indebted to his wife, Rita Ballard Fames, for extensive and continuing 



aid in many ways, especially in the preparation of the manuscript and 



the illustrations. 



Arthur J. Eames 



