66 Bulletin 7 i^a 



Richmond, 1839. 4°, 32 pp. 

 See Geology of the Virginias. 



Report of the Progress of the Geological Survej^ of Vir- 

 ginia for the Year 1839. 

 Richmond, 1840. 8°, i6i pp. 

 See Geology of the Virginias. 



Report of the Progress of the Geological Survey of Vir- 

 ginia for the Year 1840. 

 Richmond, 1841. 8°, 132 pp. 

 See Geology of the Virginias. 



On the Porous Anthracite or Natural Coke of Eastern 



Virginia. 



Amer. Jour. Sci., vol. xliii. pp. 175-176, 1842. 



Observations of Subterranean Temperature in the Coal 



Mines of Eastern Virginia. 



Trans. Assoc. Atner. Geol. and Nat., 1840-42, pp. 5-^2- 

 538. 



{Abst.) Amer. Jour. Sci., vol. xliii, p. 176, 1842. 



Geology of the Virginias, 1884, p. 569. 



On the Connection of Thermal Springs in Virginia, with 



Anticlinal Axes and Faults. 



Trans. Assoc. Amer. Geol. and Nat., 1840-42, pp. 323- 

 347, pi. 16. 



{Abst.) Amer. Jour. Sci., vol. xliii, p. 176, 1842. 

 Geology of the Virginias, 1884, p. 578. 



On the Age of the Coal Rocks of Eastern Virginia. 



Trans. Assoc. Amer. Geol. and Nat.. 1840-42, pp. 298- 

 316, pi. 14. 



(Absf.) Amer. Jour. Sci., vol. xliii, p. 175, 1842. 

 Geology of the Virginias, 1884, p. 645. 



Report of the Progress of the Geological Surve}' of the 



State of Virginia for the Year 1841. 

 Richmond, 1842. 8°, 12 pp. 

 See Geology of the Virginias. 



Papers on the Minerals, Meteorites, (Grayson and Roan- 

 oke Counties), Virginia. 



Amer. Jour. Sci., vol. xliii, pp. 168-182, 1842. 



On the Limits of the Infusorial Stratum in Virginia. 



Amer. Jour. Sci., vol. xlv, pp. 313-314, 1845. 



