202 REPORT OF NATIONAL MUSEUM, 1892. 



5. A series of mineral pseudomorphs. 



6. A series to illustrate cleavage and fracture. 



7. A series to illustrate diaphaneity, color and lustre. 



8. A series of gems and ornamental stones. 



ACCESSIONS. 



Among the most important accessions, mention may be made of the 

 following: 



Twenty-live boxes of minerals from Pennsylvania, the gift of Joseph Willcox, of 

 Philadelphia. (Aec. 24802.) 



A suite of 11 specimens of minerals from Branchville, Conn.; 1 specimen from 

 Salisbury, Conn., and 1 specimen from Brewsters, N. Y., the gift of Prof. 8. L. Pentield, 

 «»f Yah' University. (Ace. 25202.) 



Four specimens of ornamental stones and 1 specimen of chnrchite, the gift of 

 Mr. Clarence S. Bement, of Philadelphia. (Ace. 25395.) 



A crystal of spangolite from Tombstone. Ariz., the gift of Prof. S. L. Penfield, of 

 Yale University. (Acc.25421.) 



Two cut specimens of transparent spessartite from Amelia C. H., Va., the gift of 

 Mr. Ira R.Allen, of Fair Haven, Xt. (Ace. 25739.) 



Three specimens of native gold from the Potomac Mine, Montgomery Co., Md., 

 deposited by Mr. A. B. Russ, of Washington, D. C. (Ace. 24805.) 



Twenty-nine specimens of ornamental stones from various localities, purchased 

 of Mr. W. J. Knowlton, of Boston, for the World's Columbian Exposition. (Ace. 

 2151."..) 



Thirty-two specimens of minerals from various localities, nine of them for the 

 World's Columbian Exposition, purchased of H. A. Ward, of Rochester. (Ace. 

 24778 and 24779.) 



Eleven gems from Maine and Xew Hampshire, bought of Mr. T. F. Lamb, of Port- 

 laud, for the World's Columbian Exposition. (Ace. 24927.) 



Nineteen specimens of minerals from various localities purchased of Messrs. 

 English & Co., New York City, for the World's Columbian Exposition. (Ace. 

 2 IS lit. ) 



In addition to the foregoing, several lots of minerals have been 

 received from the U. S. Geological Survey. 



The condition of the collection, with the exception of the study 

 scries, which is only partly classified, is very satisfactory. The sys- 

 tematic exhibition series of minerals is displayed in twenty-two mahog- 

 any and plate-glass double slope-top cases, arranged in rows in the 

 exhibition hall. The series is arranged mainly according to Dana's 

 system, and each specimen is mounted on an ebonized wooden block, 

 li inches thick, on the beveled front of which is fastened a gray card- 

 board label, clearly printed, giving the name of the species, its variety, 

 the locality of the specimen, the name of its donor or collector, and its 

 catalogue number. 



When the installation has been completed, the series will be provided 

 with species labels, indicating the chemical composition of each species, 

 its crystallographic form, hardness, specific gravity, its varieties with 

 tlieir characteristics, and any additional information which maybe of 

 public interest. 



