36 Bulletin 7 92 



Heyward, B. H., On a Zinc- Bearing Clay from the Neigh- 

 borhood of the Bertha Zinc Mines, Pulaski County, Vir- 

 ginia. 



Cheni. News, vol. xliv, p. 207, 1881. 



Geol. Record, 1880-84 incl., London, 1889, vol. ii, p. 198. 



The Virginias, vol. iii, p. 4, 1882. 



Hidden, W. B., A Transparent Crystal of Microlite, Amelia 

 Court House, Virginia. (Communicated). 



Amer. Jour. Sci., 3d ser. , vol. xxx, p. 82, 1885. 



Hildreth, S. P., Observations on the Saliferous Rock Forma- 

 tion, in the Valley of the Ohio. 



Amer. Jour. Sci., vol. xxiv, pp. 46-68, 1833. 



Observations on the Bituminous Coal Deposits of the 



Valley of the Ohio, and the Accompanying Rock Strata; 

 with Notices of the Fossil Organic Remains and the 

 Relics of Vegetable and Animal Bodies, Illustrated by a 

 Geological Map, by Numerous Drawings of Plants and 

 Shells, and by Views of Interesting Scenery. Appendix 

 by S. G. Morton, pp. 149-154. 



Amer. Jour. Sci., vol. xxix, pp. 1-148, pis. 1-36, maps 

 and secftions, 1836. 



Hill, Robt. T., (See under Day, D. T.). 



Hitchcock, C. H., The Crystalline Rocks of Virginia, Com- 

 pared with Those of New England. 



Trans. Amer. Inst. Min. Engrs. , vol. x, pp. 477-480, 

 1882. 



Geol. Record, 1880-84 inch, London, 1888, p. 377. 

 The Virginias, vol. iv, pp. 11- 12, 1883. 



Remarks on the Stru6lure of the Blue Ridge in Virginia. 



Bull. Geol. Soc. Amer., vol. ii, p. 164, 1891. 



Hitchcock, Kdw., Description of a Brown Coal Deposit in 



Brandon, Vermont, with an Attempt to Determine the 



Age of the Principal Hematite Beds in the United States. 



Amer. Jour. Sci., 2d ser., vol. xv, pp. 95-104, figures, 



1853. 



For Virginia, see pp. 101-102. Statement of Prof. J. Wyman, 

 relative to the discovery of fossil fruits in the Tertiary at Rich- 

 mond, Virginia, — probably Eocene. 



Hodge, JaS. T., Observations on the Secondary and Tertiary 



