66 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 146. 
398 Ries (Hem rich). Clay industries of New York. 
N. Y. State Mus., Bull., vol. iii, No. 12, 262 pp. 
Describes the occurrence of clay deposits iu Quaternary, Tertiary, and 
Cretaceous strata of the State. Gives a list and figures of diatoms found 
in Cretaceous beds, and includes an account of the clay industries and 
a map of the State, showing the location of clay deposits and manufac- 
, tories. 
399 On a granite-diorite near Harrison, Westchester County, N. Y. 
N. Y. Acad. Sci., Trans., vol. xiv, pp. 80-86. 
Describes the petrographic characters of a granite-diorite, of a gneissic 
structure, occurring at the locality named. 
400 Robertson (James D.). The Missouri lead and zinc deposits. 
Am. Geol., vol. xv, pp. 235-248. 
. Describes the differences between the deposits of the southwestern; 
portion of the State and those of the central and southeastern, the 
characters of the country rock, and the forms and mode of deposition of 
the ore bodies. Describes the lead and zinc compounds and accessory 
minerals. Reviews some of the theories advanced to account for the 
origin of these deposits, and discusses the evidence in support of the 
author's hypothesis. 
401 [Lead and zinc deposits in Missouri.] 
See Winslow (A.), No. 564. 
402 Rolker (Charles M.). The production of tin in various parts of 
the world. 
U. S. Geol. Surv., 16th Ann. Kept., part iii, pp. 458-538. 
Includes statistics of production in various countries and notes on 
the occurrence of tin in Maine, Virginia, North Carolina, Alabama, 
Texas, South Dakota, and California. 
403 Rowley (E. E.). Description of a new genus and five new species 
of fossils from the 33evonian and sub-Carboniferous rocks of 
Missouri. 
Am. Geol., vol. xvi, pp. 217-223. 
Describes Aristocrinus n. gen. and five new species. 
404 Ruedmann (E.). Synopsis of the mode of growth and develop- 
ment of the graptolitic genus Diplograptus. 
Am. Jour. Sci., 3d ser., vol. xlix, pp. 453-455. 
Describes and figures the results of observations made upon a large 
collection of specimens of Diplograptus found near Dolgeville, N. Y« 
405 Run&all (W. H.). Quicksilver ores at Guadalcazar, Mexico. 
Sci. Am. Suppl., vol. xl, pp. 16289-16290. 
Describes the occurrence of quicksilver at this vicinity. 
406 Russell (Israel C). Eeview of "Eeport on surface geology/' by 
E. D. Salisbury. 
Jour, of Geol., vol. iii, pp. 358-364. 
407 The influence of debris on the flow of glaciers. 
Jour, of Geol., vol. iii, pp. 823-832. 
Discusses the rate of flow of glaciers as affected by glacial erosion and 
subglacial deposition, the unconsolidated deposits beneath glaciers, ter- 
minal moraines, and the variations of glaciers. 
