Notes on the Pathogenesis of Sprue and the Asthenic Diarrhœa of Indians: With Special Reference to the Rôle Played Therein by Amœbiasis. The Probable Identity of the Two Former Conditions, and Their Connection with Addisonian Anæmia-Subacute Combined Degeneration of the Cord-Hunterian Glossitis Syndrome of Hurst.