Decaisne, J. 



Muséum of Natural History 



MondayAprill2, 1869 



My dear Engelmann, 



Because I am unable to offer you my picture in exchange of yours, which I appreciate very much, I beg you to 

 accept a book, which I wish to believe, will aiso be a remembrance from a fiiend whose dévotion has increased 

 with time and has not let distances weaken it. 



My vows accompany you, with ail my heart. 



Decaisne, J. 



