Philadelphia to work up the rich treasures gathered on his long journey. For several years he and Dr. Pickering worked harmoniously together at the Academy of Natural Sciences—the former on his own collections, the latter on the Schweinitz herbarium. Two important memoirs based upon the fruits of the trip across the continent were published about 1840 in the Transactions of the American Philosophical Society. Conchology was a new subject of study to Nuttall, and he became much absorbed in it. He did not trouble himself much about his meals when at work, and Dr. Pickering would often return after an hour's absence from the Academy hall in the middle of the day and find him stooping over a case of shells in the same place and position as when he left him.
Nuttall was a remarkable-looking man. His head was very large, bald, and bore the signs of a vigorous intellect; his forehead was expansive, but his features small, and his gray eyes looked out from under fleshy brows. His complexion was fair, and sometimes very pale from close application to study and lack of exercise. He was above medium height, his person stout, with a slight stoop, and his walk peculiar and mincing, resembling that of an Indian.
He was naturally shy and reserved, but, if silent and perhaps morose in the presence of those toward whom he felt no attraction, yet with congenial companions he was communicative and agreeable. It will readily be surmised that his devotion to science frequently led him into actions that were strangely at variance with the circumstances of the moment. In one of his solitary digressions in the wilderness he got lost. The party he was with resumed its march, sending out some friendly Indians to find him and bring him to rejoin it. The Indians performed their duty faithfully. Looking upon him, however, as a great medicine man, they were afraid to come close to him, so they surrounded him, keeping at a respectful distance. Nuttall soon became aware that he was watched by savages, and, not knowing whether they were friends or foes, became intensely alarmed. From what he had already experienced at their hands he had the utmost horror of Indians. Therefore hiding himself, and taking advantage of every ravine, every tree and bush, he succeeded in regaining the track of the caravan, which he followed for three days without food or sleep, when, to his infinite delight, he overtook it and was relieved from his anxieties.
On another occasion he was rambling in the vicinity of the camp when a band of Indians, apparently hostile, made its appearance. The alarm was immediately given, with orders to prepare for an expected attack. Nuttall was nowhere to be seen, and a friend ran in search of him. It was not long before he per-
