24S 



INDEX. 



Clays, discussed, 137. 



Climate, discussed, 183. 



College Park, precipitation at, 196. 



temperatures at, 195. 

 Collington Saud.v Loam, 152. 



chemical analyses of, 155. 



mechanical analyses of, 157. 

 Columbia Group, 116. 

 Conrad, T. A.. 31, 36, 37, 3s, 40, 41, 41 



45, 46. 

 Contents, 11. 

 Cordwood, 237. 

 Cretaceous clays, 138. 

 Ci'others. Austin L., 5, 9. 

 Crystalline rocks, discussed, 84. 



sedimentary record of, 127. 



waters of, 147. 

 Cultural treatment of forests, 243. 



Dall, W. H.. 57, 66. 



Darton, X. H., 56, 58, 59, 62, 65. 



Desor, E.. 43. 



Diatomaceous earth, discussed, 142. 



Ducatel. J. T., 26, 37, 39, 40, 41. 



Dug wells, discussed, 146. 



Geological Survey Commission, 5. 

 Geology, discussed, 83. 

 Glauccnite marls, 141. 

 Granite-Gneiss, discussed, 84. 

 Gravels, discussed, 140. 

 Grazing, 241. 



H 



Harlan, R., 37. 

 Harris, G. D., 59. 

 Hayden, H. H., 35. 

 Hellprin, Angelo, 48. 49. 

 Hickory, 236. 

 Higgins, James, 43. 46. 

 Historical Review. 24. 

 Hydrography, discussed. 207. 



I 



Illustrations. I.ist of. 15. 



Infusorial earth, 142. 



Interpretation of Geologic record, 127. 



Introduction, 21. 



Iron ore, discussed. 142. 



K 



Keith, A., 65. 

 Keyser, W., 58. 



Elktooi clay, 174. 



mechanical analyses of, 176. 

 Eocene, discussed, 100. 



sedimentary record of. ]31. 

 Eocene water-horizon, 150. 

 Estuaries, 76. 

 Export woods, 239. 



Fairhaven diatomaceous earth, 108. 



Fence timber, 239. 



Finch, John, 35, 36. 



Fisher, R. S.. 43. 



Ffntaine. W. M.. 54, 07. 



Forests, discussed. 219. 



use of, 236. 

 Forest fires, 240. 

 Forest management, 243. 

 Forest types, 221. 

 Forest ti'ees, 233. 

 Fort Foote, precipitation at, 197. 



temperatures at, 197. 

 Fort Washington, precipitation at. 198. 



temperatures at, 198. 



G 



Gkibbro, discussed, 85. 



Geological Record, interpretation of, 127. 



Lafayette formation, 112. 



age of, 112. 



areal distribution of, 112. 



character of materials of. 113. 



paleontologic character of, 115. 



physiographic expression of,' 114. 



sedimentary record of. 98. 



stratigraphic relations of, 115. 



thickness of, 115. 

 Lafayette plain, 73. 

 Lafayette stage, 79. 

 Laurel, precipitation at, 200. 



Patuxent river at. 208. 



temperatures at, 199. 

 Leidy, Jos., 46. 

 Leonardtown Loam, 164. 



mechanical analyses of, 165. 

 Leonardtown gravelly loam, 166. 

 Lower Cretaceous, discussed, 85. 



sedimentary record of, 128. 



water in, 148. 



M 



Maclure, William, 26. 34. 



Magnetic declination, disctissed, 215. 



Magothy formation, 93. 



areal distribution of, 94. 



