
          go back to Cambridge
 till summer.


 Last evening Prof Silliman,
 Senior gave me some old
 letter of my grandfather.
 One of them, date Feb. [February] 30 1819
 speaks of "Dr. John Torrey of
 N. Y. [New York] in connection with
 some strange earth resembling
 baryta, & says I presume
 you know him to be one of 
 the most preserving naturalist
 and chemists in
 our country."
        