Heaven, Earth and Man in the Book of Changes. By Hellmut Wilhelm. Seattle and London: University of Washington Press (Institute for Comparative and Foreign Area Studies, Publications on Asia No. 28), 1977. xii, 230 pp. Index. $12.95.Researches on the I Ching. By Iulian K. Shchutskii. Translated by William L. MacDonald and Tsuyoshi Hasegawa with Hellmut Wilhelm. Introduction by Gerald W. Swanson. Princeton: Princeton University Press (Bollingen Series 62.2), 1979. lxvi, 255 pp. Tables, Bibliography, Index.