THREE weeks had wrought encouraging changes among the small patients on Overlook Mountain, changes visible not alone to professional eyes. Little Duke was growing so plump that “Grocer Jack,” who brought up daily supplies from the village, and who was as lank as the proverbial beanpole, declared that he was coming up to board with Benedicta. Clementina Cunio was able to walk a full half-mile to one of the neighboring farmhouses without exhaustion, where the good wife always welcomed her with eager arms, never omitting the important word that she believed she grew strong every minute. Timmy Dennis and Jeffy Orton, who down in Fair Harbor had been too weak more than mildly to............