BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 93 
Headden, William I*. 
1115. Mineralogical notes, no. III. — Colorado Sci. Soc, Proc, vol. 8, pp. 
107-182, 1906. 
Describes cassiterite from North Carolina and South Dakota, phosphorescent zinc- 
blendes from Utah and California, and jamesonite, meneghite, huebnerite, wolframite, 
and tapiolite from South Dakota. 
1116. Some phosphorescent calcites from Fort Collins. Colo., and Joplin, 
Mo.— Am. Jour. Sci., 4th ser., vol .21, pp. 301-308, April, 1906. 
1117. An examination of some coals from Routt County, Colorado. — Colo- 
rado Sci. Soc, Proc, vol. 8, pp. 257-280, March, 1907. 
1118. A study of some Colorado coals — a comparison of some coals from 
Boulder, Routt, and Delta counties. — Colorado Sci. Soc, Proc, vol. 8, pp. 281- 
300, May, 1907. 
1119. Phosphorescent calcites. — Mineral Collector, vol. 14, no. 2, pp. 21-22, 
April, 1907. 
Hedburg, Eric. 
1120. The Wisconsin zinc fields. — Mining World, vol. 24, no. 3, pp. 61-62, 
January 20, 1906. 
Heikes, V. C. 
Production of gold and silver in 1905 in Arizona, Idaho, and Utah. — See no. 
2418. 
The production in Arizona and in Utah in 1906 of gold and silver. See no. 
2419. 
Heilprin, Angelo. 
1121. Mont Pele in its might. A scientific study of the volcano's activity, 
from data gathered at the crater's mouth. — McClure's Magazine, vol. 19, no. 4, 
pp. 359-368, 9 figs., August, 1902. 
1122. The rock of the Pele obelisk and the condition of the volcano in Feb- 
ruary, 1906.— Science, new ser., vol. 24, pp. 25-26, July 6, 1906. 
1123. The shattered obelisk of Mont Pele. — Nat. Geog. Mag., vol. 17, no. 8, 
pp. 465-474, 5 pis., August, 1906. 
Describes the condition of the summit of Mont Pele and discusses the mode of forma- 
tion of its former spine. 
1124. The concurrence and interrelation of volcanic and seismic phenomena. — 
Science, new ser., vol. 24, pp. 545-551, November 2, 1906. 
1125. The concurrence and interrelation of volcanic and seismic phenomena. — 
Congr. geol. intern., C. R. 10° sess., Mexico, 1906, pp. 187-196, l!i<)7. 
1126. The Catskill Mountains.— Am. Geog. Soc, Bull., vol. 39, no. 4, pp. 
193-199, April, 1907. 
Describes the physiography and geologic history of the Catskill region. 
Henderson, Junius. 
1127. The Tertiary lake basin of Florissant. Colorado. -Colorado Univ., 
Studies, vol. :;. no. .",, pp. 145-156, 1 pi., 1906. 
Gives an account of the mode of formation and character of the Florissanl forma- 
tion of Colorado, notes upon the physiographic and geologic history, and ;i bibliography. 
1128. Topographic development of Chalk Bluffs and Pawnee Buttes.— 
Colorado Sci. Soc, Proc, vol. 8, pp. 247-256, 7 figs., March. 1907. 
Hendrixson, W. S. 
1129. Sonic features of the [owa ground waters. Iowa Acad. Sci., Proc, 
vol. 14, pp. 1ST -199, 1907. 
