DEPARTMENT OF GEOLOGY. 263 



KOTTTTNE WORK. 



The cliiiracter of the routine work has not varied materially from 

 that of previous years. About 1,()(H] labels have l)een written, copy of 

 which has been sent to the Public Printer; up to date, 1,385 of these 

 have been returned to us in printed form. 



Duplicates have been sent out mainly in the way of exchanges as 

 below : 



To Pi'of. P. Grotli, Mniiicli, navaria, 3 samples of peridotite and pyroxenite. 



To. Prof. "William llobbs, ihulisou, Wis., 44 specimens miscellaneous eruptive 

 rocks. 



To B. Sturtz, Bonn, Prussia. :?(i3 specimens of rocks and ores from miscellaneous 

 American sources. 



To Loreu B. Merrill, Paris, Me., 12 specimens of rocks and ores. 



To L. H. Merrill, Orono, Me., 1 specimen ijlionolite from the Black Hills, S. Dak. 



'^o Dr. H. H. Jolinstou-Lavis, Naples, Italy, 66 specimens of eruptive rocks. 



To Prof. H. A. Green, Cliester, S. C., 14 specimens of rocks and ores. 



To Prof. J. A. Uddeu, Rock Island, 111., 6 samples of volcauic dusts. 



To Dr. E. M. Edwards, Newark, N. J., 17 samples of lake bed deposits and infusorial 

 earths. 



To Prof. William North Rice, Middletown, Conu., 4 specimens of eruptive rocks. 



To the Columbian University, W.'ishingtou, D. C, 52 specimens of rocks. 



On three occasions collections of rocks have been lent for study, as 

 noted elsewhere. 



The work of identifying- material sent in by those not connected with 

 the Museum continues, as heretofore, to consume its full share of time. 

 The followiug list of " special reports " will serve to give some idea of 

 the extent of this practice. As stated previously, the Department can 

 not make analyses or assays on such occasions, but whenever possible 

 without too great an outlay of time the mineralogical nature of the 

 material has been ascertained and the applicant referred elsewhere for 

 information not attainable here. These leports were as follows: 



Supposed tin oies; sent by W. D. McComb, San Bernardino, Cal. No. 71)3. 



Rock supposed to be iiulicative of coal; sent by J. S. Lupton, Winchester, A'^a. 



No. 797. 

 Supposed lava from the " Wakulla Vcdcano;" sent by A. W. Barber, Tallahassee, 

 Fla. No. 798. 



Quartz supposed to contain ore; sent by D. B. Harris, Payson, Ariz. No. <S()(). 

 Siipi)osed petrification ; sent by P. B. Jacobs. No. 801. 



Calcite, f;y)»sum, and con^lonu'rat<^; sent by S. P. Wright, Elkano, Kans. No. 804. 

 Galena ; sent by S. H. Wright, Longview, Tex. No. 805. 



Chloritic mica schist; sent by Hon. F. B. Stockbridge, U. S. Senate. No. 810. 

 Magnesian limestone; scut by the ]). H. Ranck Publishing Company, Indiana]iolis, 

 Imi. No. 811. 

 Siliceous rock carrying iron sul|tlinrfts; sent by Geo. W. Watkins, Moriali, N. Y. 



No. 812. 

 Ochers aud clays; scut by J. T. Hamillon, Spokane Falls, Wash. No. 814. 

 Bog iron ores; sent by Thos Jackson, Plymouth, Mass. No. 815. 

 (iranite; sent by J. W. Baker, Belvedere Hotel, Washingtou, D.C. No. 824. 

 Supposed gold ore; st-nt by F. A. Zeigler, Boyd's Station, Md. No. 828. 

 Supposed tin ore; sent by N. W. Parrish, Weuatcbee, Wash. No. 830. 

 Supposed tin ore; sent by Eniil Wilvert, Sunbury, Pa. No. 835. 



