SUBJECT INDEX 451 



nitrogen. Beck. Nitrogen Gas. Min. rep. (for 1838) 1839. p.l4. Mln. 



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

 ITitrogen springs. Beck. Nitrogen Springs. Min. rep. (for 1837) 1888. 

 P.47-4S. Min. N. Y. 1842. p.133-34. Mus. rep. 8 rev. ed. (for 1849) 1850. 

 p.116. 

 Emmons. Springs of Cliateaugav. Geol. rep. 2d dist. (for 1886) 1837. 



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

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

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

 ITomenclature, see New York series. 

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



See also Crystalline rocks; Gabbros. 

 Norma.nskill shales. Ruedemann. Normauskill 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 Rysedorpli 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 18SS) 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.ll9- 



21; 14 (for 1860) 1861. p.S9-92. 

 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.398-94. 



Geol. N. Y. pt4. 1843. p.278-S3. 

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



(for 1840) 1841. p.l72. 

 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.2S0-83. 

 See also Catskill division; Catskill formation; Devonian. 

 Olean quadrangle. Clarke. Paleontologic Results of the Ai'eal 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. 



