REPORT OF COMMITTEE OX PHOTOGRAPHS. 471 



The photographs should be accompanied by a statement whether duplicates and 

 lantern-slides can be obtained, and at what price, and the address of the person to 

 whom application for them should be made. It is suggested that in order to save 

 trouble to donor, arrangements be made with local photographers to whom the 

 negatives may be entrusted to till orders. 



Initials in parentheses at the end of labels indicates authorship within the com- 

 mittee. 



Register of Photographs received in L891. 



Photographed and Presented by Dr. G. II. Williams, of Johns Hopkins University, Bal- 

 timore, Md. 



Size, about 4j x (U inches. Photographs of laboratory specimens. 



294. Appalachian structure: anticlinal fold running into a synclinal; Cumber- 



land, Md. 



295. Anticlinal fold ; Animikee slate. Pigeon point, lake Superior. 



296. Folded Halla-flinta; Naerodal, Norway. 



297. Gneiss; Stony Point-on-the-Hudson, N. Y. 



298. Slate, showing bedding, cleavage and rigid calcareous layer; Bangor, Pa. 



299. Quartz-schist, with stretched tourmaline; Shoemaker's quarry, Green Spring 



valley, Baltimore' co.. Md. 



300. Dike of red granite in green hornblendite ; Pigeon island, near Marquette, Mich. 



Photograplied and Presented by G. P. Merrill, of the United States National Museum, 



Washington, I>. ( '. 



Sizes, 4 x 5 and 8 x 10 inches. 



301. Slate, showing cleavage and faulting (compare 298) : Bangor, Pa. 



.">():.'. Gneiss, showing foliation natural size) ; from blocks in the building-stone 

 collections of the United States National .Museum; Lawrence and West 

 A ndover, Mass. 



303. Pyroxenite nodules, partially altered into serpentine ; Montville, N. J. (3 nodules 



on one plate, published in Proc. U. S. Nat. Museum, vol. xi, 1888, p. 11-. pi. 



x x x i i . 



304. Quarry in Triassic sandstone; Portland, Conn. The view shows the varying 



thicknesses of the beds and their nearly horizontal arrangement. 



305. Fold in slate quarry; Bangor, Northampton co., Pa. The slaty cleavage ex- 



tends from the left slightly downward to the right and directly across the 

 apex of the fold. 



306. The franklin slate quarry; Slatington, Lehigh co., Pa. The view shows the 



slaty cleavage cutting across the bedding at a high angle, the quarry opening 

 being near the apex of a fold. 



307. Slate quarry; Bangor, Pa. In the distant right, at the fool of the derrick, a 



fold in the slate is shown s.miewhat indistinctly. 



308. Marble quarry ; West hut land, N't. View looking do^ nward from the surface 



and showing the inclined position of the beds. (This view forms plate i of 

 the Handbook of the Collection of Building and Ornamental Stones in the 

 dnited States National Museum, Smithsonian Report, l885-'86, part Li;. 



309. Granite quarry ; Hallowell, Maine. This view shows the lenticular character 



of the sheets and their imbricated arrangement. Nearly vertical joint-faces 

 are shown at the right This viev forms plate viii in the 1 [andbook named 



aho\ e. 



