
          Cambridge 20th July 55 [1855]
 Friday Evening 


 Dear Doctor


 I have your 2 letters 
 of the 17th, for 2 days part I 
 have been interrupted from work, 
 now I go at it again. 


 Meanwhile you have a letter 
 from me, in reply to yours about 
 the Nettle*, & you have also received 
 the sheet of Ann. Sci. Nat. [Annales des sciences naturelles] I hope. 


 On the envelope of your 
 letter last [hit one?] you say 
 "Return Beckwith's proof
 to me." But I have not 
 received any Beckwith's proof
 from you. Have you sent
 any?


 How do you to find new 
 pig-weeds in every collection!


 ____________________________________
 * Also enclosing what Thurber
 wants to get the package of Fl. Brazil [Flora brasiliensis]
 by
        