weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 65 
562 Nason (Frank L.). The origin of vein cavities. 
Eng. and Mg. Jour., vol. 71, pp. 177-179, 209-210, 1901. 
Discusses the origin of these vein phenomena. 
563 Nevins (J. N.). Roofing- slate quarries of Washington County 
[New York]. 
N. Y. State Mus., 53d Ann. Kept., vol. 1, pp. rl35-rl50, pis. 26-37, 
1901. 
Describes the slates of the various quarries. 
564 Emery mines of Westchester County [New York]. 
N. Y. State Mus., 53d Ann. Kept., vol. 1, pp. rl51-rl54, pis. 38-41, 
1901. 
565 Newland (D. H.). The serpentines of Manhattan Island and 
vicinity and their accompanying minerals. 
School of Mines Quart., vol. 22, pp. 307-317, 399-410, figs. 1-4, 1901. 
Describes the microscopic and chemical characters of the serpentines 
and the minerals associated with them. Discusses origin of the serpen- 
tines. 
566 Nichols (Henry W.). Nitrates in cave earths. 
Jour. Geol., vol. 9, pp. 236-243, 1901. 
Abstract: Am. Geol., vol. 28, p. 58 {h p.), 1901. 
Reviews paper by William H. Hess on the same subject, gives a 
number of analyses of soil, limestone, and cave earth and discusses the 
origin of the nitrates. 
567 Nicolson (J. T.), Adams (Frank D.), and. An experimental 
investigation into the flow of marble. 
See Adams (F. D.) and Nicolson (J. T.), 5. 
568 Norton (William Harmon). Geology of Cedar County [Iowa]. 
Iowa Geol. Surv., vol 11, pp. 282-396, pis. 7-12, figs. 16-27, and maps, 
1901. 
Describes the physiographic and drainage features, the character and 
occurrence of the Silurian, Devonian, and Pleistocene deposits and the 
occurrence of economic products. 
569 The relation of physical geography to other science subjects. 
Science, new ser., vol 14, pp. 205-210, 1901. 
570 Nutter (Edward Hoit). Sketch of the geology of the Salinas 
Valley, California. 
Jour. Geol., vol. 9, pp. 330-336, 8 Jigs., L901. 
Describes the formation of the valley and the character and occurrence 
of the Tertiary strata which were laid down in this trough. 
571 Nylander (Olof O.). Shells of the marl deposits of Aroostook 
County, Maine, as compared with the living tonus in the 
same locality. 
Nautilus, vol. 14, pp. 101-104, 1901. 
Gives list of fossils determined. 
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