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492 were described in these volumes, and much was done toward revising the characters and synonymes of the older ones. The work was published by subscription, and, from the labor involved in its preparation, only a limited edition could be sent out. It is now a very rare work, but one which must be quoted by whoever would write upon the grasses or sedges of North America.

A paper was read before the New York Lyceum of Natural History, in December, 1834, entitled "A Notice of Some New, Rare, or Otherwise Interesting Plants from the Northern and Western Portions of the State of New York, by Asa Gray, M. D." This first brought its author prominently before the botanists of the day. It was a matter of no little surprise that a young man, working in a field heretofore thought to be well explored, should not only bring to light several new species, but clear up the confusion that surrounded many which had long been kept in a state of uncertainty by the older botanists.

In 1838, the first part of the "Flora of North America" appeared under the joint authorship of John Torrey, M. D. and Asa Gray, M. D. It proposed to give "abridged descriptions of all the known indigenous and naturalized plants growing north of Mexico." This was published in numbers from time to time, and was suspended at the end of Compositæ. The value and thoroughness of this work, the faithfulness with which it embodied all that was known of our plants up to the time of publication, can only be appreciated by those who have had occasion to use the work. It is so frequently quoted as "Torrey and Gray," that had these two eminent coworkers made no other contributions to the science, they would still be accorded the title of our first botanists. The union of these botanists upon the Flora was most fortunate, as each had special fondness for certain parts of the work, and thus, the labor being divided, the whole became more complete than if either had undertaken the entire task. If we mistake not, the Compositæ of the Flora was mainly the work of Dr. Gray—a task the difficulties of which can only be appreciated by working botanists. The relations between the authors of the Flora have been charming to those whose pleasure it has been to know of them, and are most touchingly expressed by Dr. Gray in the dedication of his Manual in 1867, in which he writes: "To John Torrey, LL. D. Almost twenty years have passed since the first edition of this work was dedicated to you—more than thirty since, as your pupil, I began to enjoy the advantage of being associated with you in botanical pursuits and in a lasting friendship. The flow of time has only deepened the sense of gratitude due to you from your attached friend." We have said thus much about Torrey and Gray, for it is not possible to speak of the botanical career of one without reference to the other.

It was stated that the "Flora of North America" was suspended with the completion of the Composite Family. When the work had reached this point the phrase "growing north of Mexico" had a widely-different