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merit of the collection. Without these faculties it would have been impossible, 

 in such a short time, to put these collections in shape for the purpose of pre- 

 senting them to you. 



I am, Gentlemen, very respectfully, yours, 



R. Osten Sackex. 



New York, January 25th, 1870. 

 To the Trustees of the American Museum of Natural History : 



Gentlemen — I wish to present to you a collection of American and European 

 Lepidoptera, consisting of about three thousand species, represented by at least 

 ten thousand specimens. This collection will be ready for delivery as soon as 

 suitable drawers are furnished by the Museum for its reception. The Butter- 

 flies will require twenty and the Moths forty drawers similar in size to those in 

 which the valuable collections presented by Baron Osten Sacken are arranged. 

 I will be glad to add to your Library one hundred volumes of books on 

 Entomological and Conchological subjects. 



I am, gentlemen, yours; very respectfully, 



Coleman T. Robinson. 



