
          [Note in pencil: [Nov. 30, 1849]]


 Jane Street - [crossed out: Thurs] Friday Morn'g [Morning]


 My dear friend--


 An unexpected circumstance
 induces me to trouble you with a letter, as
 I was unable to call upon you on Wed'y Aftn [Wednesday Afternoon]
 as I had intended. A British Officer in
 Canada (Dr. Maclagan of the Roy'l [Royal] Can. [Canadian] Rifles, to me 
 personally unknown) has sent me on a package
 of his "doubtfuls" for solution, amongst which
 are some potamogeta [Potamogeton], a genus which I never
 studied, & of which I know very little. Being
 therefore called upon to teach, I must first learn
 & hence have to beg the favor of you to lend
 me your set of Potamog. [Potamogeton] as they came from
 the hands of your "friend" [Edward] Tuckerman, whose
 disciple I propose to become [pro_____?]. If 
 you have a duplicate of his paper, please let
 me have it-- if not, I can borrow Brother Sam's [Samuel Thomas Carey]
 Sill. Journ. [Silliman's Journal, i.e. The American Journal of Science and Arts]. If you will trouble yourself
 with this package, when you come to town,
 I will call at the Med. Coll. [Medical College] & fetch it thence.


 Please bear in mind the Frémont Umbellif. [Umbelliferae from an expedition led by John Charles Frémont]
 & such few Eriog. [Eriogonum] as may be forthcoming-- but I
 am in no haste for either of them, & merely put the
 matter on record now, that you may not forget it.
        