SUBJECT INDI/X 451 



Nitrogen. Beck. Nitrogen Gas. Min. rep. (for 1838) 1839. p.14. Mln. 



N. Y. 1842. p.174-75. 



Nitrogen springs. Beck. Nitrogen Springs. Min. rep. (for 1837) 1838. 

 p.47-48. Min. N. Y. 1842. p.133-34. Mus. rep. 3 rev. ed. (for 1849) 1850. 

 p.116. 

 Emmons. Springs of Chateaugay. Geol. rep. 2d dist. (for 1836) 1837. 



p.122-23 (ed. 2, p.124-25). 



Hall. Nitrogen Springs. Geol. N. Y. pt4. 1843. p.308-9, 451. 

 Mather. Gaseous and Thermal Springs. Geol. N. Y. ptl. 1843. p.104-8. 

 Nomenclature, see New York series. 

 Norite. Smock. Norite. Mus. bul. 10. 1890. p.205. 



See also Crystalline rocks; Gabbros. 



Normanskill shales. Ruedemann. Normanskill Beds (Lower Dicello- 

 graptus zone). Mus. bul. 42. 1901. p.538-44, 550-52. Same, Mus. rep. 

 54 (for 1900) 1902. 3:538-44, 550-52. 

 Ruedemann. Trenton Conglomerate of Rysedorph Hill, Rensselaer Co. 



N. Y. and its Fauna. Mus. bul. 49. 1901. p.3-114: 7pl. 

 Nunda group, see Portage group. 

 Oak caterpillar. Felt. Yellow Striped Oak Caterpillar. Forest, Fish and 



Game Com. rep. 7 (for 1901). In press. 

 Oak worm. Lintner. Orange Striped Oak Worm. Ent. rep. 5 (for 1888) 



1889. p.192-200. Same, Mus. rep. 42 (for 1888) 1889. p.192-200. 

 Oaktrees, see Forest trees. 



Ochers. Beck. Stone Paints, Ochres. Min. N. Y. 1842. p.60-61. 

 Octahedrite. Beck. Anatase! Min. N. Y. 1842. p.428. 



Whitlock. Octahedrite. Mus. bul. 58. 1902. p.76. 

 Odonata, see Neuropteroid insects. 



Ohio. Hall. New Species of Fossils from the Hudson River Group of 

 Ohio and other Western States. Mus. rep. 13 (for* 1859) 1860. p.119- 

 21; 14 (for 1860) 1861. p.89-92. 

 Hall & Whitfield. Notice of Three New Species of Fossil Shells from 



the Devonian of Ohio. Mus. rep. 23 (for 1869) 1873. p.240-41. 

 See also Cincinnati; Waverly sandstone. 

 Oil, see Petroleum. 

 Old red sandstone (Catskill formation). Conrad. Old Red Sandstone 



Group. Pal. rep. (for 1838) 1839. p.62. 

 Conrad. Old Red Sandstone or Devonian System. Pal. rep. (for 1840) 



1841. p.41-42. 

 Hall. Old Red Sandstone. Geol. rep. 4th dist. (for 1839) 1840. p.393-94. 



Geol. N. Y. pt4. 1843. p.278-83. 

 Hall. Old Red Sandstone of Chautauqua County. Geol. rep. 4th dist. 



(for 1840) 1841. p.172. 

 Hall. Old Red Sandstone of Steuben County. Geol. rep. 4th dist. (for 



1839) 1840. p.397. Geol. N. Y. pt4. 1843. p.482. 

 Hall. Organic Remains. Geol. N. Y. pt4. 1843. p.280-83. 

 See also Catskill division; Catskill formation; Devonian. 

 Olean quadrangle. Clarke. Paleontologic Results of the Areal Survey. 



Mus. bul. 52. 1902. p.524-28. . 

 Glenn & Butts. Stratigraphy and Paleontology of the Olean quadrangle. 



Pal. rep. (for 1902). In press. 

 Oligoclase. Hunt. Oligoclase. Mus. rep. 21 (for 1867) 1871. p.81-82. 



Merrill. Oligoclase. Mus. bul. 19. 1898. p.121. Same, Mus. rep. 51 (for 



1897) 1899. 1:121. 

 Whitlock. Oligoclase. Mus. bul. 58. 1902. p.90. 



