68 [August, 1841. 



" the perfect fly appears early in June, lives but a short time, 

 deposits its eggs and dies." The remainder of Mr. Say's history 

 must apply to that species which has been so frequently observed 

 to deposit its eggs on the leaf." 



A letter was read by the Corresponding Secretary from 

 Major James D. Graham, U. S. A., dated July 30, 1841, ten- 

 dering his acknowledgments for his election as a correspond- 

 ing member of the Academy. 



STATED MEETING, August 17,lS41. 

 Vice President Morton in the Chair. 



DONATIONS TO LIBRARY. 



Gardener's Dictionary. By Philip Miller, F. R. S., F. A. 7th 

 edition. Fol. London, 1759. From Mr. Phillips. 



Report of the Secretary of War in reference to the construc- 

 tion of the Potomac Aqueduct. Svo. Washington, 1841. 

 From Col. Abert. 



Written Communication. A lettter was read from Owen 

 Mason, Esq., of Providence, Rhode Island, acknowledging 

 his election as corresponding member of the Society. 



Dr. Morton (Dr. Coates taking the chair) made some re- 

 marks on the sutures of the cranium as connected with the 

 growth of the corresponding bones. 



Headverted to the opinion long in vogue, that the chief use of the 

 sutures was to facilitate the process of parturition ; a theory which 

 is refuted by the fact that they exist in the skulls of all the ovipar- 



