BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 191 
Villarello, Juan D. — Continued. 
2451. Description des mines " La Bella Union," (Etat de Guerrero). Genese 
des gisenients de mercure. — Soc. cient. "Antonio Alzate," Mem. y. Rev., t. 23, 
pp. 395-411, 1905. 
Describes the local geology, and the occurrence, character, and origin of the mercury 
ores. 
2452. Aplicacion de la fluoresceina a cuestiones de salubridad ptiblica. — 
Soc. cient. "Antonio Alzate," Mem. y Rev., t. 24, no. 2, pp. 51-62, August, 1900. 
Discusses the use of fluorescein in the study of underground waters. 
2453. Fii nuevo fluoroscopic. — Soc. cient. "Antonio Alzate," Mem. y Rev., 
t. 24, no. 2, pp. 63-72, 1 fig., August, 1906. 
Describes a new fluoroscope for use in the study of underground waters. 
2454. Hidrologia subterranea de las cercanlas de Jiutepec (Estado de More- 
los) [Mexico!. — Soc. cient. "Antonio Alzate," Mem. y Rev., t. 24, no. 4, pp. 
159-171, October, 1906. 
Discusses underground waters in the environs of Jiutepec, State of Morelos, Mexico. 
2455. Le mineral de Mapimi [Mexico]. — X e Congr. geol. intern., Guide des 
Excursions, Mexico, no. XVIII, 18 pp., 2 pis., 1906. 
Describes the character, occurrence, relations, and genesis of the ore deposits. 
2456. Le mineral d'Aranzazu (Etat de Zacatecas). — X e Congr. geol. intern., 
Guide des Excursions, Mexico, no. XXV, 29 pp., 3 pis., 1906. 
Describes the local geology, and the occurrence, character, and origin of the copper 
ores, and the mines. 
2457. Sur le remplissage de quelques gisements metalliferes. — Congr. geol. 
intern., C. R., 10 e sess., Mexico, 1906, pp. 533-553, 1907. 
2458. Hidrologia subterranea de los alrededores de Queretaro [Mexico]. — 
Mexico, Secretaria de Fomento, Bol., 2 a epoca, ano 7, no. 4, IV, pp. 65-81; no. 5, 
IV, pp. 84-96, 3 pis., 1907. 
Discusses the underground water resources of Queretaro. 
2459. Geologie chimique des gisements de soufre de Mapimi, Etat de Du- 
rango.— Soc. cient. "Antonio Alzate," Mem. y. Rev., t. 26, no. 4, pp. 115-145, 1907. 
Discusses the origin of sulphur deposits. 
Villarello, J. 1)., Flores, T., and Robles, R. 
2460. Etude de la Sierra de Guanajuato [Mexico]. — X e Congr. geol. intern., 
Guide des Excursions, Mexico, no. XV, 33 pp., 2 pis. (geol. map and sections), 
1906. 
Includes an account of the ore deposits. 
Vogdes, Anthony Wayne. 
2461. Bibliographical sketch of Dr. John B. Trask, first state geologist 
of California.— San Diego Soc. Nat. Hist., vol. 1, no. 2, pp. 27-30, 1 pi. (port), 
1907. 
Gives a sketch of his life (1824-1879) and a list of his geological and paleontologlcal 
publications. 
2462. The genus Encrinurus: its history, its species, its proper division in 
the family of trilobites. — San Diego Soc. Nat. Hist., Trans., vol. 1, no. 2, pp. 
01-82, 3 pis., 1907. 
Wade, William Rogers. 
2463. Burro Mountain copper district [New Mexico]. — Eng. and Min. Jour., 
vol. 84, pp. 355-356, 5 figs., August 24, 1907. 
Waitz, Paul. 
2464. Phenomenes postparoxysmiques dn San Andres, Michoacan. — X p Congr. 
geol. intern., Guide des Excursions, Mexico, no. X, 29 pp., 1906. 
