2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147102We compute higher-order differentials of the period map for curves and show how they factor through the corresponding higher Kodaira-Spencer classes. Our approach is based on the infinitesimal equivariance of the period map, due to Arbarello and De Concini \cite{AD}.36 pages, LaTeX. This corrects a reference in the earlier versionAlgebraic Geometrytext