The Publishing Committee have great pleasure in 

 acknowledging the very valuable donation lately re- 

 ceived by the Academy from their president, Wil- 

 liam Maclure, Esq. 



This donation includes many very rare, costly and 

 splendid works on Natural History, which in addi- 

 tion to those previously in the possession of the Aca- 

 demy, many of which have likewise been presented 

 by Mr. Maclure, constitute one of the most valuable 

 and extensive Libraries of Natural History in the 

 United States. 



The succeeding catalogue includes a part only of 

 Mr. Maclure's recent donation, the publication of the 

 remainder is unavoidably postponed for the present. 

 It will appear at the end of the volume, together 

 with a list of donations to the Museum. 



