Jackson.] 



114 [January 16, 



assumed the deformity mentioned by Dr. J. Barnard Davis 

 in connection with the premature closing of the sagittal su- 

 ture. 



The Secretary stated that the Council recommended a 

 division of the Curatorship of Geology and Palaeontology 

 into its two branches. 



On motion of Dr. Jackson, the proposition of the Council 

 was accepted, and Drs. J. B. S. Jackson and J. C. White ap- 

 pointed a conmiittee to nominate a candidate for the Cura- 

 torship of Geology, Mr. T. T. Bouve retaining that of Palae- 

 ontology. 



The Committee reported the name of Mr. W. T. Brigham, 

 and he was elected. 



Prof H. J. Clark of Agricultural College, Penn., was 

 elected Corresponding Member. 



Rev. Adams Ayer of Roxbury, Thomas Dwight, Jr., Prof 

 J. B. Henck, Rev. C. F. Knight, and Michael O'Shae of 

 Boston, were elected Resident Members. 



January 16, 1867. 

 The President in the chair. Thirty-six members present. 



Mr. T. T. Bouve read a letter from Mr. "William Munroe, 

 concerning the globular specimens of stone presented by him 

 at a recent meeting, and presented a piece of American touch- 

 stone which he had received from a jeweller in New York. 



Mr. C. T. Jackson said that the touchstone was still in use 

 by the watchcase makers here ; he once had occasion to test by 

 better methods, the accuracy of their judgment. The stone 

 used was a polished black Bazanite, and with it were em- 

 ployed twelve gold "keys" of known composition, and of 

 graduated fineness ; by means of a comparison between the 

 mark left on the Bazanite by the gold under test, and that by 

 one of the keys, and by the treatment of the same with ni- 

 tric acid, they were able to estimate within a carat or two, 



