“ Dr. Gray was elected professor of Natural History in the just-organized University of Michigan, and when the staff of the Wilkes expedition was to be diminished he resigued in favor of the assistant botanist, Wm. Rich.
As in the year or more in which he had been working at it, Dr. Gray had accomplished so much work, Dr. Torrey invited him to become joint author of the Flora of North America. ”

“ In that winter, 1827-8, he chanced to read the article Botany in Brewster's Edinburgh Encyclopredia. He was greatly interested, bought Eaton's Manual and read its pages eagerly, longing for spring. He sallied forth early, discovered a plant in bloom, brought it home and found its name in the Manual to be Clayionia Virginica, the species Caroliniana to which the plant really belonged, not being distinguished then. ”

“ But the autumn brought a letter from Dr. Torrey saying that the prospects of the school were so poor that he could not afford to employ him. Nevertheless he went to New York, assisted Torrey as be had opportunity, and issued the second century of “Gramineæ.”
4 In the summer of 1835 he returned to his father's home with some books received from Dr. Lehmann, of Hamburg, in exchange for plants. In this summer he planned and partly wrote his “Elements of Botany,” and when he returned to New York in the autumn, arranged for its publication. It appeared in May 1836. ”

“ Torrey, and worked all the spare time in his herbarium. At this time he issued the first century of “Gramineæ and Cyperaceæ of North America.” In December, 1834, he read his first paper before the New York Lyceum of Natural History, entitled: “A Monograph of N. Am. Rhynchosporæ,” and a second one, “A notice of some new, rare or otherwise interesting plants from the northern and western portions of the State of N. Y.” In February or March he retured to his school work at Utica, but the summer again found him collecting plants and minerals in northeastern New York. ”

“ In the frequent rides about the country to visit patients he had abundant facilities for observing and collecting plants, and, besides studying out their names, he began a herbarium. In the autumn, when he returned to the medical school, he took with him a bundle of specimens which had puzzled him, hoping to get assistance from Professor Hadley. ”

“ Torrey's death, in 1873. Young Gray's medical course was closing. He had attended four annual courses of lectures, besides the work with his preceptors, had passed the examinations, and in the spring of 1831, six or seven months before he passed his 21st birthday, he received the degree of M. D.
3 In the latter part of May and June he delivered his first course of lectures on botany, Dr. Beck, who had been lecturing previously, having given up the engagement. With the money thus earned, he made a collecting tour through western New York, going as far as Buffalo and Niagara Falls. ”

“ Many of the plants which he colIected in this locality came into possession of B. D. Greene, and are to be met with in various herbaria labeled “Coll. Greene.” The winter was spent at the Bartlett school, but the spring saw him on another collecting tour along the Black river. During the summer he gave a course of leetures on mineralogy and botany at Hamilton ColIege, Clinton, N. Y., for Professor Hadley.
In the autumn he got a furlough from the Bartlett school in order that he might be Dr. Torrey's assistant in chemistry in the medical school at New York. During this winter, 1834-5 (?) ”

“ About this time he received an appointment as teacher of chemistry, botany, geology and mineralogy in a private school for boys in Utica, controlIed by a Mr. Bartlett. His first snmmer vacation was spent in a trip through southern New York, Pennsylvania and New Jersey, collecting plants, fossils and minerals. At Bethlehem he spent a day with Bishop Schweinitz. Arriving in New York City, in September, he met Dr. Torrey for the first time, and went with him on a colIecting trip to Tom's River, N. J.
During the next summer he was employed by Dr. ”