Jackson.] 304 



touch of sand driven by the wind would give a finer poUsh 

 than could be made by any other mechanical agency. Spec- 

 imens of these rocks submitted to the lapidary's wheel were 

 found to receive a less brilUant polish. 



The Corresponding Secretary read a letter from Messrs. F. 

 H. and J. B. Bradlee, Boston, January 29th, 1866, presenting 

 a life size portrait of Audubon, by Healy. The Secretary 

 was requested to express in behalf of the Society, its high 

 appreciation of this valuable gift. 



The Corresponding Secretary also read the letters received 

 since the last announcement, as follows : 



From the Literary and Philosophical Society of Manchester, 

 December 30th, 18G5, the K. K. Geologische Reichsanstalt, Wien, 

 and the Schweizerische Gesellschaft fUr die gesammten Naturwissen- 

 schaften, Bern, January 2d, 1866, the Royal Society of Edinburgh, 

 January 9th, 1866, the Museum of Comparative Zoology, Cambridge, 

 Mass., January 20th, 1866, the American Philosophical Society, Phil- 

 adelphia, January 31st, 1866, and the Lyceum of Natural History, New- 

 York, February 7th, 1866, acknowledging the receipt of the Society's 

 Publications ; the Mannheimer Verein fiir Naturkunde, Mannheim, 

 January 2d, 1866, and the K. Akademie der Wissenschaften, Wien, 

 January 11th, 1866, presenting their publications; the Societe En- 

 tomologique de Belgique, December 14th, 1865, Naturforschende 

 Gesellschaft des Osterlandes zu Altenburg, the Oberhessische Gesell- 

 schaft, Giessen, January 2d, 1866, the Societe Royale des Sciences a 

 Upsal, January 11th, 1866, and the Societe des Sciences Physiques et 

 Naturelles du Departement d'llle et-Vilaine, Rennes, February 10th, 

 1866, acknowledging the receipt of the Society's publications, and pre- 

 senting their own ; the Royal Geological Society of h-eland, December 

 29th, 1865, and the Royal Society of Sciences at Upsal, January 

 11th, 1866, desiring back numbers of the Society's publications; the 

 R. Accademia di Scienze, Lettere ed Arti, Modena, the Societe Aca- 

 demique d'Archeologie, Sciences et Arts du Departement de I'Oise, 

 Beauvais, and the Cercle Artistique, Litteraire et Scientifique d'An- 

 vers, February 10th, 1866, and the Ecole Lnperiale des Mines, Paris, 

 February 12th, 1866, agreeing to exchange publications; the Societe 

 de Biologic, Paris, February lOth, 1866, and the Civico Museo, Trieste, 

 February 12th, 1866, agreeing to exchange publications, and request- 

 ing an exchange of specimens ; the Editor of the Ibis, London, Decem- 

 ber 12th, 1865, declining to exchange publications ; Prof Nevil Story 

 Maskelyne, British ]\hiseum, December 14th, 1865, Prof Henry Y. 

 Hind, Fredericton, N. B., December 25th, 1865, and Louis Janin, Jr., 



