These years are a good deal mixed up, and I cannot settle their dates nor the order of events. Only I know that the next autumn I got a furlough from the school until toward the end of winter, that I might accept Dr. Torrey’s invitation to be his assistant during his course of chemical lectures in the Medical School, and at his house in the herbarium, living with him, and receiving eighty dollars as pay. This I can fix as the winter of 1833-34 or 1834-35. The first century of my “North American Gramineæ and Cyperaceæ” was got out that winter, and it bears the date of 1834.[20] In February or March I went up by stagecoach from New York to Albany, thence to Bridgewater, and so to Utica, to do my work at Bartlett’s school. That finished, made a second trip to the northeast part of the State, collecting in botany and mineralogy with Dr. Crawe, extending the tour to St. Lawrence County, where we found fine fluor-spar and great but rough crystals of phosphate of lime, idiocrase, etc. I wrote some account of these for the “American Journal of Science,” the earliest of my many contributions to that journal. Returning toward autumn to Bridgewater, I there received a letter from Dr. Torrey, informing me that the prospects of the Medical College were so poor that he could not longer afford to have my services as assistant. Bartlett’s school I had resigned from on account of my prospects in New York. And, in fact, the school was then going down, and he [Bartlett] was transferred soon after to Poughkeepsie, where he flourished anew for a time. I was in a rather bad way. But I determined to go to New York, assisted Dr. Torrey as I could, got out the second part of my “North American Gramineæ and Cyperaceæ.” I am not sure whether I was in Dr. Torrey’s family or not, or for only a part of the winter. But in the spring of 1835, I went up to my father’s house for the summer, with some books, among them a copy of De Candolle’s “Organographie” and “Théorie Elémentaire.” These or at least the former came from Professor Lehmann,[21] of Hamburg, with whom for a year or two I had corresponded and exchanged plants, or received books in exchange for plants. I had made a still earlier exchange with Soleirol, a French army surgeon, who had collected in Corsica. While at home I blocked out and partly wrote my “Elements of Botany.” Returned to New York in the autumn; went into cheap lodgings, arranged with Carvill & Company to take my book. I think they gave one hundred and fifty dollars, which was a great sum for me. We got it through the press that winter. John Carey had then come down to New York, and was a great help to me in proof-reading, and the little book was published in April or May, 1836.