Dr. Green presented for the Museum a fine specimen of rattle- 

 snake, preserved in alcohol, which he had received from Dr. 

 Spinzig. 



Dr. George Engelmann gave an interesting account of his re- 

 cent journey through Europe, and especially of observations 

 made during an eruption of Mt. Vesuvius. 



December i, 1869. 



Vice-President Wislizenus in the chair. 



Five members present. 



The Corresponding Secretary read a letter from J. M. Currier, 

 M.D., Secretary of the Orleans County Society of Natural His- 

 tory of Vermont. 



Dr. Wislizenus reported the result of his meterological observa- 

 tions for November : Mean temperature, 393° ; average for 30 

 years, 43. 4 ; range during the month, 55 ; rain fall, 7.48 inches, 

 nearly twice the average quantity. 



Lieut. J. C. Clifford, U. S. A., was elected an associate member. 



December 20, 1869. 



Vice-President Wislizenus in the chair. 



Eight members present. 



Exchanges received were laid upon the table. 



Dr. Wislizenus exhibited a fossil tooth, said to have been found 

 in St. Louis by Mr. Shands. The fossil having been referred to 

 the authority of Dr. Joseph Leidy, of Philadelphia, was deter- 

 mined by him to be 'a lower molar of Entelodon Mortoni, be- 

 longing to the fossils of the Mauvaises Terres" of Nebraska. Dr. 

 Leidy had promised to send to the Academy a copy of his new 

 work on the " Extinct Mammalian Fauna of Dakota and Ne- 

 braska," which would soon be published. 



