DEPARTMENT OF LITHOLOGY AND PHYSICAL GEOLOGY. 407 



(1-1) The CT. S. Geological Survey has furnished much interesting 



»*iii(l valuable material, among whicb should be mentioned (1) someone 

 bundled and fifty specimens of rocks from Utah, Montana, California, 

 and Oregon, collected under the direction of Mr. J. S. Diller, and com- 

 prising tberalites, dacites, quartz basalts, and saxonites, as well as fine 

 examples of rain-eroded limestones, jointed shales, and volcanic bombs 

 with large inclosures of granular olivine : (i!) someone hundred speci- 

 mens of trachyte from near Rosita, in the Silver Cliff region, Colorado, 

 collected by .Mr. 0. Whitman Cross; (3) a series of sixty-four photo- 

 graphs illustrating the topography of lake shores, glacial geology, the 

 tufa deposits of Lake Lahontan, etc., prepared under the direction of 

 Mr. I. C. Russell ; (i) specimens of clay baked by burning lignite beds, 

 and other rocks and concretions from Dakota and Montana, collected by 

 Dr. A. C. Peale ; (5) the entire collection, comprising some two thou- 

 sand specimens, of the rocks of the Comstock lode and Washoe district, 

 Nevada, from the study of which were prepared the results embodied 

 by Mr. Becker in his reportof the geology of this region ( Monograph in, 

 U. S. Geological Survey), and also in Messrs. If ague and Iddings' paper 

 on the Development of Crystallization in Igneous Rocks (Bull. U.S. 

 Geological Survey, No. 17), and ((!) an instructive series of decomposed 

 rocks, soils, and residual clays, collected under the direction of Mr. I. 

 C. Russell. 



(15) A large slab (29 by 77 inches) of Triassic sandstone from Tur- 

 ner's Falls, Massachusetts, with fossil footprints. Selected for the 

 Museum by Prof. 0. II. Iiitchcook, of Hanover, and obtained from Mr. 

 T. M. Stoughton, of Turner's Falls. 



(l(i) The following materials collected by the Curator, as above al- 

 luded to, may also be mentioned : The peridot ites and pyroxenites from 

 near Webster and Cullasaja, North Carolina; peridotite, serpentines, 

 vermiculites, and crushed and faulted slates from Pennsylvania ; weath- 

 ered talcose schists from Maine ; serpentines from Massachusetts; gran- 

 ite from Concord. New Hampshire; orbicular granite from Craftsbury, 

 Vermont; norite from Keeseville, New York; serpentines and ophio- 

 lites from Essex County. New York; all the above being collected in 

 quantity to furnish material not only for our own exhibition scries, but 

 also lor duplicates. 



ROUTINE WORK. 



Since the death of Mr. A. J. Forney, which took place October 30, 1888, 

 the department has been without a preparator skilled in stone cutting 

 and polishing, and hence but little work of this nature has been done. 

 Mr. J. O. Hargrove, who was appointed as a temporary assistant on 

 September 25, has rendered very satisfactory service in trimming hand 

 specimens for the exhibition and study series, and has rendered valu- 

 able assistance in the work of re arranging the exhibition series. The 

 clerical work of the department has been carried on, as during the pre- 



