6o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



255. Shaler, N. S. 



Fluviatile swamps of New England. 



Am. Jour. Sci., (3) xxxiii, 210-221, 1887. Abstract: Pop. 

 Sci. Mon., xxxiii, 142, 143, 1887. 



Discussion of differences between rivers flowing from north to 

 south, and those flowing from south to north. The former have ter- 

 races and no swamps; the latter have no terraces and numerous 

 swamps; caused probably by a depression of land at south, thus lower- 

 ing the grade of north-flowing streams. 



(No reference to individual Connecticut streams. — Ed.) 



256. Sheldon, J. M. A. 



Concretions from the Champlain clays of the Connecti- 

 cut valley. 42 pp., 123 figs, of nearly natural size, illus- 

 trating the " Stone-Arms Collection." A bibliography re- 

 lating to works on concretions is also given. Boston, 

 1900. 



Concretions are described from the Connecticut valley, including 

 Hartford and Windsor, Connecticut; they are formed in the clay by 

 robbing the clay of its lime. Analysis shows concretions to be about 

 one-half clay or sand. The process by which concretions are formed 

 is discussed, also the factors which determine their shape. 



257. Shepard, C. U. 



Notice of a mine of spathic iron (steel ore) of New 

 Milford, and of iron works of Salisbury, Connecticut. 

 Am. Jour. Sci., (i) xix, 311-326, 1831. 



History of the New Milford mine, which at first was worked for 

 silver; geology of the region — the iron and quartz exist together 

 as a seam 6-8 feet wide in the gneiss; description of the ore; Salisbury 

 iron works — occurrence of the ore, theory of its origin, history of the 

 opening of the ore, annual yield, etc. 



258. Shepard, C. U. 



A report on the geological survey of Connecticut, 186 

 pp., published by the State, New Haven, 1837. 



This report consists of three parts: i. Aa economical report, in 

 which the mineral resources of the state are described under the fol- 

 lowing heads: — metals; coal; plumbago; gems; polishing and grinding 

 materials; soapstone and potstone; materials for alkaline and earthy 

 salts; material for bricks, pottery, porcelain, and glass; fire stone; 

 fluxes; quicklime and water cement; stove paints; decolorizing car- 

 bonaceous slate; material for architecture and decoration; material for 

 flagging, tiling and paving; material for agriculture; mineral springs. 

 2. Scientific report, in which the minerals and ores occurring in Con- 

 necticut are described and classified. 3. A catalogue of the collections, 

 containing 595 specimens. 



259. Shepard, Charles Upham. 



Biography. 



Am. Jour. Sci.. ( t,) xxxi, 482, 483, 1886. 



