1886.] NEW YORK ACADEMY OF SCIENCES. 223 



Academ}'. These rocks extend to the top of Mount Mitchell and 

 are bedded with hornblende schist in limited amount. 



Eastward ly, this series is succeeded by strata of shining'slates, 

 well exposed in the tunnels and cuttings of the railroad. 



Remarks were made by Dr. Julien and the Secretary. 



April 12, 1886. 



Stated Meeting. 



The President, Dr. J. S. Newberry, in the chair. 



Eight persons present. 



Dr. J. J. Friedrich exhibited some fine specimens of oligo- 

 clase, albite and beryl from New York Island. 



The President read some measurements, comparing the skel- 

 eton of the elephant "Jumbo" with that of the mastodon in 

 Ward's Museum at Rochester. 



April 19, 1886. 



Stated Meeting. 



The President, Dr. J. S. Newberry, in the chair. 



Eighteen persons present. 



Mii. George F. Kunz read the following 



mineralogical notes. 



A. On the hardness of a Brazilian diamond. 



Messrs. Tiffany & Co. have, during the past year, been con- 

 ducting another experiment similar to the one described in the 

 American Journal of Science, July, 1885, and before the New 

 York Academy of Sciences, June, 1885. In this instance a piece 

 of hard round bort from Brazil was placed in the machine for 

 cutting, the other cutting diamond being a South African crystal 

 weighing 4^ carets. If used for cutting other diamonds, an 

 equal amount of this bort will always be removed by an equal 



