weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 67 
495 Merrill (Frederick J. H.). Mineral resources of New York State. 
N. Y. State Mus., Bull. .vol. iii. No. xv, pp. 365-595, two geologic maps in 
pockets, 1895. 
Describes the general characters and occurrence of building stones in 
the Cambrian, Silurian, and Devonian strata, and the occurrence of clay, 
salt, abrasive materials, petroleum. (Jives list of the quarries, clay 
manufacturers, producers of lime and cement, and mineral springs of 
New York. 
496 Post-Pliocene deposits of Sankaty Head [Massachusetts]. 
N. Y. Acad. Sci., Trans., vol. xv, pp. 10-16, 1896. 
Gives a section and list of contained fossils of beds formed of trans- 
ported material in the island of Nantucket. 
497 Notes on the geology of Block Island [Rhode Island]. 
N. Y. Acad. Sci., Trans., vol. xv, pp. 16-19, 1896. 
Describes two sections, and concludes they arc post-Pliocene and are 
underlaid by Cretaceous sands and clays. 
498 Merrill (George Perkins). Notes on asbestus and asbestiforui 
minerals. 
U. S. Nat. Mus., Proc, vol. xviii, pp. 281-299, 1896. 
Describes the material from different parts of the United States, and 
suggests that the material used commercially is usually anthophyllite. 
499 - Disintegration and decomposition of diabase at Medford, Mass. 
Geol. Soc. Am., Bull., vol. vii, pp. 349-362, pi. 16, 1896. 
Describes the occurrence of the dike, and gives a mechanical analysis 
of the disintegrated rock and chemical analyses of fresh and disinte- 
grated diabase. Compares theso analyses with those of diabase from 
Venezuela and granite from the District of Columbia. Discusses the 
"time limit and extent of disintegration" and "the relative rapidity of 
rock weathering in high and low latitudes.*' 
500 The principles of rock weathering. 
Jour, of Geol., vol. iv, pp. 701-721 and 850-871, 1896. 
Pe views some of the literature of the subject and describes the agen- 
cies that promote rock weathering. 
501 An occurrence of free gold in granite. 
Am. Jour. Sci., 1th ser., vol. i, pp. 309-311, 1896. 
Describes an occurrence of gold embedded in the clear glassy quartz 
and unfissured feldspars of a granitic rock from Mexico. 
502 On the composition and structure of the Hamblen County, 
Tenn., meteorite. 
Am. Jour. Sci., 4th ser., vol. ii. pp. 119-155, ligs. 1-2, 1896. 
Describes the occurrence, chemical composition, and optical characters 
of the meteorite. 
503 The onyx marbles: Their origin, eoinposition, and uses, both 
ancient and modern. 
Stone, vol. xii, pp. 116-121, 228-236, 320-330, 125-129, 559-564; vol. 
xiii, pp. 9-12, 116-120, pis. 5-18, 1896." 
See Bibliography and Index for 1895, No. .">::!'. 
