No richer or more instructive experience could well have offered itself to him at twenty-three than this journey to Brazil seemed to promise. He was no sooner on the Amazon, however, than it became clear to him that he was not intended to be a field-naturalist; and he pictured the stages of this self-discovery in long, diary-like letters which he sent home to his family. On arriving at Rio he was forced to consider the question of his going on or coming home, by an illness that kept him quarantined for several uncomfortable weeks, and left him depressed and unable to use his eyes during several weeks more. Although he decided in favor of continuing with Agassiz, he revealed more and more clearly in his letters that he was seeing Brazil with the eye of an adventurer and lover of landscape rather than of a geologist or collector, and that the months spent in fishing and pickling specimens were to count most for him by teaching him what his vocation was _not_. He found that he was essentially indifferent to the classification of birds, beasts, and fishes, and that he was not made to deal with the riddle of the universe from the only angle of approach that was possible in Agassiz's company. It would be a mistake, however, to let it appear that nine months of collecting with Louis Agassiz were nine months wasted. There are some men whom it is an education to work under, even though the affair in hand be foreign to one's ultimate concern. Agassiz was such an one, "recognized by all as one of those naturalists in the unlimited sense, one of those folio-copies of mankind, like Linnæus and Cuvier." Thirty years after, James could still say of him: "Since Benjamin Franklin we had never had among us a person of more popularly impressive type.... He was so commanding a presence, so curious and enquiring, so responsive and expansive, and so generous and reckless of himself and his own, that everyone said immediately, Here is no musty _savant_, but a man, a great man, a man on the heroic scale, not to serve whom is avarice and sin."[30]--"To see facts and not to argue or _raisonniren_ was what life meant for Agassiz," and James, who was already incorrigibly interested in the causes, values and purposes of things, and whose education had been most unsystematic, profited by his corrective influence. "James," said Agassiz at this time, "some people perhaps consider you a bright young man; but when you are fifty years old, if they ever speak of you then, what they will say will be this: That James--oh, yes, I know him; he used to be a very bright young man!" Such "cold-water therapeutics" were gratefully accepted from one who was not only a teacher but a kind friend; and James remembered them, and recorded later that "the hours he spent with Agassiz so taught him the difference between all possible abstractionists and all livers in the light of the world's concrete fullness, that he was never able to forget it." Considering with what