_June 17._ Absent, since my last date, on a tour to New-York. Four other specimens of Solomon's seal, trientalis, azalea, 2 species of crowfoot, blue-eyed grass, medeola, moose-bush, and several species of vaccinium, in flower. The small trillium, or smiling wakerobin, sarsaparilla, and dentaria, blossomed during my absence. _June 22._ Small enothera, 2 species of veronica, and the golden senecio, in flower. _June 23._ Mountain ash, Norway potentilla, sanicle, and the lovely linnea in flower. _June 28._ Prunella, and red and white clover, in flower. _June 29._ Mitchella, in flower. _June 30._ Yellow diervilla, in flower. _July 1._ Climbing corydalis, in flower. _July 4._ The fimbriate archis, and roundleaved pyrola, in flower. _July 5._ Spiked epilobium, and roundleaved mallows, in flower. _July 6._ Mullen, in flower. _July 7._ Small geranium in flower. _July 8._ Another species of epilobium, in flower. _August 18._ Frost this morning. ZOOLOGY. ART. X. _Notes on Herpetology, by_ THOMAS SAY, _of Philadelphia_. (Communicated by the Author.) Although I have not devoted a particular study to this department of the science of nature, yet I have been amused and instructed by casually observing many of the subjects of it, when I have been rambling in their native haunts, pursuing objects more particularly interesting to me. But when perusing, the other day, the account of the copper-head of our country, by Mr. Rafinesque, I was impelled to ask for information on the subject, through your useful publication, in which that account appeared, and to make, at the same time, a few miscellaneous remarks or notes. These are in part included in the present essay, and if they should have a tendency to incite attention to the reptilia of the United States, at present in a state of confusion and incertitude, some portion of benefit will be rendered to the great cause of science. I think that a moderate degree of labour and observation bestowed upon the investigation of the species already described, would prove the unity in nature of some species which have been considered as distinct by all the authors, would detect many errors in observation, expose some deceptions practised on credulity by the designing, and would enable us to fix, with some degree of accuracy, our knowledge of truth and of the species. A work devoted particularly to this class, by some one adequate to the task, who could have in his view all the known species, is indeed a desideratum.