
          Cambridge 18 April, 1857 


 Dear Dr. 


 I have yours of the 16th. 
 It will not do to send my 
 proofs on to Washington after 
 yours. The two would puzzle 
 the printers. You will have to 
 retain yours till you get mine, 
 & then transfer the marks, as 
 far as needful. (Except for 
 the Compositae & the Scrophs [Scrophularia],
 which I will send to Washington. 
 It is no use my reading the 
 proofs if my marks are not 
 received & used by printer. 
 The proofs must be read 
 by author. 
 Take no more jobs without 
 a written engagement that you 
 shall see proofs & your remarks be 
 attended to. 
 And send back all proofs by 
 1st mail.
        