52 A Bibliography of the Geology, etc., of California. 



Ob?orvations on the extent of the gold regions of California 

 and Oregon, with notices of mineral localities in Cali- 

 fornia and some remarkable specimens of crystalline 

 gold; by W. P. Blake. Am. Jour. Sci., 2d ser., Vol. 20, 

 1855, pp. 72-85. 



Earthquakes in California during the year 1856; by Dr. J. B. 

 Trask. Am. Jour. Sci., 2d ser., Vol. 23, 1857, pp. 341- 

 346. 



Fossil plants of recent formations; by Leo Lesquereux. Am. 

 Jour. Sci., 2d ser.. Vol. 27, 1859, pp. 359-363. 



On the direction and velocit}'' of the earthquake, in California, 

 of January 9, 1857; by John B. Trask. Am. Jour. Sci., 

 2d ser.. Vol. 25, 1858, pp. 146-148. 



Progress of the Geological Survey of California; by J. D. Whit- 

 ney. Am. Jour. Sci., 2d ser., Vol. 38, 1864, pp. 256-264. 



Notes on the New Almaden quicksilver mines; by B. Silliman, Jr. 

 Am. Jour. Sci., 2d ser.. Vol. 38, 1864, pp. 190-194. 



Notice of the explorations of the Geological Survey of California, 

 in the Sierra Nevada, during the summer of 1864; by 

 J. D. Whitney. Am. Jour. Sci., 2d ser., Vol. 39, 1865, 

 pp. 10-13. 



Petroleum in California; by B. Silliman, Jr. Am. Jour. Sci., 

 2d ser.. Vol. 39, 1865, p. 101, also p. 341. 



On the deep placers of the South and Middle Yuba, Nevada 

 County, California, in connection with the Middle Yuba 

 and Eureka Lake Canal Companies; by B. Silliman, Jr. 

 Am. .Jour. Sci., 2d ser.. Vol. 40, 1865, pp. 1-19. 



On the borax in California; by J. D. Whitney. Am. Jour. 

 Sci., 2d ser.. Vol. 41, 1866, pp. 255-258. 



Alleged discovery of an ancient skull in California; by W. H. B. 

 Am. Jour. Sci., 2d ser.. Vol. 42, 1866, p. 424. 



On the naphtha and illuminating oil from heavy California 

 tar (maltha); by B. Silliman, Jr. Am. .Jour. Sci., 2d 

 ser.. Vol. 43, 1867, pp. 242-246. 



