DEPARTMENT OF LITHOLOGY AND PHYSICAL GEOLOGY. 205 

 [Form of label used in bnilding-stone collection.] 



SANDSTONE.— A coarse, dark - yellow, sub -Carbon- 

 iferous sandstone, from the quarries of Isaac Crick- 

 field. 



Howard Station, Knox County, Ohio. 25,416. 



Collected by the Tenth Census, 1880. 



[Form of picture label. ] 



ROCKING BOWLDER. 



EAST LYME, NEW LONDON CO., CONNECTICUT. 36,772. 



Gift of Mr. JAMES SHEPARD, 1885. 



The granite bowlder of which the above is a photograph is situ- 

 ated in the southwest part of East Lyme, New London Co., Connecticut. 

 It is said to weigh from 30 to 40 tons. Though resting upon a com- 

 paratively small face, the strength of an ordinary man is insufficient 

 to set it in motion. 



On receipt of new material, then, the first matter to be decided upon is 

 to which one of the various collections it is best adapted, after which it 

 is cut and trimmed to such size and shape as is best suited for conven- 

 ience in handling, and best brings out the characteristics which it is 

 intended to illustrate. In all cases an entry is made in the Museum 

 catalogue giving all available details regarding the material, and the 

 corresponding number painted in oil colors upon the specimen itself. 

 Specimens designed for exhibition have temporary written labels pre- 

 pared, duplicates of which are sent to the Government Printer when a 

 sufficient number have accumulated. The copy for some two hundred 

 and fifty labels has thus been sent during the past year. 



Thirteen sets of duplicates, mostly in the way of exchange, have been 

 sent out during the period covered by this report. They are as fol- 

 lows : 



July 14, 1887, to Mr. R, N. Worth, Plymouth, England, set twenty-eight specimens 

 miscellaneous American rocks. 



August 9, 1887, to Dr. William Hallock, U. S. Geological Survey, for experimental 

 work, two samples of building stones. 



September it, 1887, to Mr. P. C. Manning, Portland, Maine, set of Bermuda rocks, 

 comprising nine specimens. 



December 2, 1887, to Mr. R, N. Worth, Plymouth, England, set of miscellaneous 

 rocks and marbles, comprising fourteen specimens. 



December 12, 1887, to Mr. T. F. Lamb, Portland, Maine, one polished slab pegma- 

 tite from Auburn, Maine. 



January 12, 1888, to Dr. George H. Williams, Johns Hopkins University, Baltimore, 

 Maryland, set of miscellaneous American rocks, fourteen specimens. 



January 13, 1888, to Prof. W. O. Crosby, Massachusetts Institute of Technology, 

 Boston, Massachusetts, set of miscellaneous American rocks, eleven specimens. 



