208 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Zirkel, Ferdinand. 
2665. The relations existing between petrography and its related sciences. — 
Congress of Arts and Science, Universal Exposition, St. Louis, 1904, vol. 4, pp. 
591-603, 1906. 
2666. Works of reference on petrology and mineralogy. — Congress of Arts 
and Science, Universal Exposition, St. Louis, 1904, vol. 4, pp. 760-761, 1906. 
Anonymous. 
2667. The Californian earthquake of April 18. — Nature, vol. 74, pp. 178-179, 
2 figs., June 21, 1906. 
2668. Joseph Frederick Whiteaves. — Geol. Mag., dec. 5, vol. 3, no. 10, pp. 
433^42, 1 pi. (port.), October, 1906. 
Gives a sketch of his life and a list of his writings. 
2669. Mining for fossils.— Sci. Am. Suppl., vol. 61, p. 25246, March 17, 1906. 
2670. Angelo Heilprin. — Philadelphia, Geog. Soc, Bull., vol. 5, no. 4, pp. 67-68, 
October, 1907. 
2671. Angelo Heilprin.— Am. Geog. Soc, Bull., vol. 39, no. 11, pp. 666-668, 
November, 1907. 
2672. Bibliography of C. L. Herrick. — Denison Univ., Sci. Lab., Bull., vol. 
13, art. 1, pp. 28-33, 1905. 
