AMERICAN NATURAL HISTORY. f 



Murchison (Rod. Imp.). On the vents of hot vapor in Tuscany > 

 and their relations to ancient lines of fracture and eruption, 



— Amer. Journ. of Sc. xi. 1851, 199. (Abstract.) (56 



Owen (D. D.). Abstract of an introduction to the final report of 

 the geological surveys made in Wisconsin, Iowa, and Min- 

 nesota, in the years 1847--'48-- ; 49 and ; 50, containing a 

 synopsis of the geological features of the country. — Proc. 

 — Amer. Assoc. Adv. Sc. v. 1851, 119. (57 



Trout (II. A.). The advantages of a geological survey of the state 

 of Missouri. St. Louis. 8vo. 1851. (58 



Bedfield (Win. C). On the post-permian date of the red sand- 

 stone rocks of New Jersey and the Connecticut valley, as 

 shown by their fossil remains. — Proc. Amer. Assoc. Adv. 

 Sc. v. 1851, 45. (59 



Kedfield (Wm. C.). On the fossil rain-marks found in the red 

 sandstone rocks of New Jersey and the Connecticut valley, 

 and their authentic character. — Proc. Amer. Assoc. Adv. 

 Sc. v. 1851- 72. (60 



Kobb (James). Notice of observations of drift striae in New Bruns- 

 wick. — Proc. Amer. Assoc, Adv. Sc. iv. 1851, 349. (61 



Rogers (Henry D.). On the coal formation of the United States, 

 and especially as developed in Pennsylvania. — Proc. Amer. 

 Assoc. Adv. Sc. iv. 1.851, 65. (62 



Ruxton (Gr. F.). On the volcanic rocks of northern Mexico. — 



— Quart, Journ. Greol. Soc. L. vi. 1851, 251. (63 



Safford (James M.). The ^ilurian basin of Middle Tennessee; 



with notices of the strata surrounding it. — Amer. Journ. 

 of Sc. xii. 1851, 252. (64 



Shepherd (Forest). Observations on the pluton geysers of Califor- 

 nia. -—Amer, Journ. of Sc. xn. 1851, 154. (65 



