2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147175This is a significant revision of the early version of this paper which was posted last December. The speculative section has been removed in light of some recent results of Morita and Kawazumi. Numerous typos have been fixed. The companion paper "The Hodge de Rham Theory of Relative Malcev Completion" has just been posted.55 pages, LaTeX2e, amsart.cls. Author supplied dvi file available from http://www.math.duke.edu/faculty/hain/Algebraic Geometrytext