123 Geological Bibliography of Virginia 67 



On Acid and Alkaline Springs. 



Proc. Amer. Assoc. Adv. Sci., 1848, pp. 94, 95. 



On the Cleavage and Other Effe<5ts Caused by Trap 



Dikes in the Middle Secondary Rocks of Virginia. 

 Proc. Amer. Assoc. Adv. Sci., vol. viii, p. 291, 1854. 

 Notice, not published. 



Natural Coke in Virginia. 



Proc. Amer. Acad. Arts and Sci., vol. iii, pp. 106, 107, 

 1854. 



On the Relation of the New Red Sandstone of the Con- 



nedlicut Valley and the Coal-bearing Rocks of Eastern 

 Virginia and North Carolina. 



Proc. Boston Soc. Nat. Hist., vol. v, pp. 14-18, 1854. 



Secondary Formations in Virginia and North Carolina. 



Proc. Boston Soc. Nat. Hist., vol. v, p. 14, 1854. 

 Geology of the Virginias, 1884, p. 765. 



On Coal Basins. 



Proc. Amer. Acad. Arts and Sci., vol. iii, p. 69, 1852-57. 



The Coke of Richmond, Virginia. 



Proc. Amer. Acad. Arts and Sci., vol. iii, pp. 106-107, 



1852-57- 



Eastern and Middle Belt of Virginia, and Eastern Belt 



of North Carolina. 



Proc. Boston Soc. Nat. Hist., vol. v, pp. 14-16, 1854-56. 



Observations on the Natural Coke and the Associated 



Igneous and Altered Rocks of the Oolite Coal Region in 

 the Vicinity of Richmond, Virginia. 



Proc. Boston Soc, Nat. Hist., vol. v, pp. 53-56, 1854-56. 



The Virginias, vol. iv, pp. 158-159, 1883. 



Geology of the Virginias, 1884, p. 677. 



On the Origin and Accumulation of the Proto- Carbonate 



of Iron in Coal Measures. 



Amer. Jour. Sci., 2d ser., vol. xxi, pp. 339-343, 1856. 



Infusorial Earth from the Tertiary of Virginia and Mary- 

 land, and Its Geological Relations. 



Proc. Boston Soc. Nat. Hist., vol. vii, pp. 59-64, 1859- 

 61. 



