1851.] 



211 



death of the animal, undergo development into the perfect plant. House-flies, 

 and especially earth-wornns, are very liable to the growth of Achlya upon them, 

 and sometimes I have even detected the growth of the latter upon the surface of 

 earth worms still living. 



Mr. Lea stated that during his recent visit to Reading, Penn., he 

 had discovered there a new locality for Zircon, a specimen of which 

 he exhibited, and also a specimen from another unrecorded locality, 

 the Yellow Springs. 



Dr. Burnett, of Boston, made a communication on the subject of his 

 recent microscopic examination of the Cicada septendecim, especially 

 of the alimentary canal and sexual organs, and of the apparatus in the 

 male for producing sound. 



The Librarian announced the donation to the Academy of a portrait 

 of its late President, Dr. Samuel George Morton, which had been exe- 

 cuted under the direction of a committee consisting of Dr. Zantzinger, 

 Mr. J. Cooke, and Mr. J. Lambert, appointed at an informal meeting of 

 the Society, held for that purpose in December 1850. The portrait was 

 painted by Mr. Paul Weber, of Philadelphia County, and is a very 

 faithful likeness. An earlier presentation of the portrait had been un- 

 avoidably prevented. The following members are the donors : Wil- 

 liam Hembel, George W. Carpenter, William S. Vaux, J. H. B. Mc- 

 Clellan, George B. Wood, William S. Zantzinger, John Cooke, Wil- 

 liam Parker Foulke, Jr., Alexander Biddle, E. J. Lewis, Thomas 

 Fisher, Thomas B. Wilson, John S. Phillips, Robert Pearsall, Robert 

 Bridges, A. L. Elwyn, Samuel Ashmead, and J. Price Welherill. 



June loth. 

 Vice-President Bridges in the Chair. 



Letters were read : 



From the Librarian of the British Museum, dated 19th May, 1851, 

 acknowledging the receipt of late Nos. of the Proceedings. 



From the Librarian of the New York State Library, dated Albanyi, 

 June 3rd, 1851, acknowledging the receipt of last No. of the Proceed- 

 ings. 



From Mr. John Hooper, dated New York, June 5th, 1851, accom- 

 panying an additional collection of American Algse, and also referring 

 to a species of Petrel supposed to be new, from the Florida coast ; 

 abdomen white, toes fa.stigiate, v/eb extending nearly to the claws, 

 claws very short and even in length, size much larger than the stormy 

 Petrel. 



From Edward Wilson, Esq., dated Lydstip House, Wales, May 14th, 

 1851, enclosino- bill of lading; and invoice of a case of books intended 

 for the Academy. 



Dr. Horner exhibited a portion of skin affected with the disease called 

 Nigrities, taken from the cheek of a white man : a part originally white 



