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three years, says Prof. H. B. Nason, to whose Biographical Record of the Rensselaer Polytechnic Institute we are most largely indebted for the material for this sketch, "Prof. Eaton diffused a great amount of knowledge on the subjects of his lectures; and so far excited the curiosity and enthusiasm of many young students that there sprung up, as a result of his labors, an army of botanists and geologists." The late Prof. Albert Hopkins, of Williams College, accrediting Prof. Eaton with being one of the first to popularize science in the Northern States, mentioned as among his special qualifications for the task an easy flow of language, a popular address, and a generous enthusiasm in matters of science, which easily communicated itself to his pupils. He adds: "Prof. Eaton was among the first in this country to study nature in the field with his classes. In pursuance of this idea, he used to make an annual excursion with Rensselaer School, sometimes leading these expeditions in person, at others deputing some competent teacher to take the lead. The cause of natural history in Williams College owes, undoubtedly, a good deal to Prof. Eaton. I think his zeal in the department of botany led Prof. Dewey to direct his discriminating mind to the study of plants, a study which he pursued farther than Prof. Eaton had done in certain lines. . . . At this time, also, Dr. Emmons took the field. In fact, natural history came on with the spring-tide, and has never lost the impulse since." While at Albany, in 1818, on the invitation of Governor Clinton, delivering a course of lectures before the members of the Legislature of New York, Prof. Eaton became acquainted with many leading men of the State, and interested them in geology and its application by means of surveys to agriculture. Here was planted the idea which eventually fructified in that great work, The Natural History of New York. In the same year Prof. Eaton published his index to the Geology of the Northern States, which has been pronounced "the first attempt at a general arrangement of the geological strata in North America." Although under the undeveloped condition of geology at the time, with the defective knowledge even among its advanced students, this book could not fail to contain many statements now known to be errors, it must be recognized as a creditable and valuable effort. An interesting view of the conditions of geology at the time and of the method of study is given in a letter which Prof. Eaton wrote to Mr. Henry R. Schoolcraft, in 1820, while preparing a second volume of the index. In it he said: "I have written the whole over anew, and extended it to about two hundred and fifty pages, 12mo. I have taken great pains to collect facts in this district during the two years since my first edition was published, but I am rather deficient in my knowledge of secondary and alluvial formations. I wish to trouble you with a few inquiries on that