Extracts from the diary of Mr. Samnel Davis, of Plymouth, in the year 1817, have recently been published. Among the entries is the following: The Medical College in Mason street is a neat brick structure, crowned by a skylight, and is an appendage to the university, the funds of which contributed $20,000 towards its erection. Invited by Dr. Jackson. I devoted a few hours to a visit there, passing in review the library room, lecture room, demonstration room, chemical room, dissecting room, bones room, mineral cabinet, etc., etc. A folio volume and plates of the bones, in the library, which is a present from Mr. Vaughan, is considered of great value, not only for its exactness, but for its rarity, the original proprietor of the work in England having destroyed the plates after 400 impressions were made, so that it is seldom met with in this country. The preparations in wax, in glass cases, of the heart, brain, eyes, are perfect exhibitions of those objects. In the midst of the tumultuous city, here all is stillness and solitude, where medical science, taking her pupils by the hand, leads them into her secret chambers, unfolding the intricacies of every department. An Apollo Belvedere and a Venus de Medici show in one room imitations in plaster cast and in marble, models of art and of the just and fairest proportions of the human form.