SMITHSONIAN INSTITUTION. 
S. P. Langley, Secretary. 
BUREAU OF INTERNATIONAL EXCHANGES. 
Washington April 13th 1891. 
Professor Sereno Watson, 
Botanic Garden, Cambridge, Mass . 
Dear Sir: 
I have to acknowledge the receipt of your note of 
the 10th instant informing me of the arrival of two boxes of 
sp«eimens,one from Mr, Durand of Paris, and one from Mr.''W. 
Barbey,Valleyr 08 near Geneva" 
The latter was forwarded to us from the Central Library 
/ 
at Bewie,anjd appeared to have been sent by E, Rat zau, Chamber y. 
Can you explain the discrepancy? 
The usual receipt form was duly mailed, but has apparent- 
ly failed to reach you. I therefore send you a duplicate, 
which I will reqxaest you to sign and return. 
Very truly yours. 
