When I had the pleasure of visiting Montpellier last year, I promised Mr. Payne to send him some vaccine matter so soon as I could obtain any: the inclosed is the first I have been able to recommend: you will oblige me by placing it in his hands. The only plan to be adopted in using it is merely to moisten it with cold water & to cover the point of the lancet well with the solution. Mrs. Dunglison unites with me in kind regards to Mrs. Madison. Very respectfully