NEW YORK MINERAL LOCALITIES 21 



221 Williams, E. H. On Crystals of Tourmaline with enveloped Orthoclase from 



Crown Point, N. Y. Am. Jour. Sci. Ser. 3. 1876. 11-273. 



222 Williams, G. H. Paramorphosis of Pyroxene to Hornblende in Rocks. 



Am. Jour. Sci. Ser. 3. 1884. 28:259. 



223 Cause of the Apparently perfect Cleavage in American Sphene 



(Titanite). Am. Jour. Sci. Ser. 3. 1885. 29:486. 



224 The Gabbros and Diorites of the Cortlandt Series near Peekskill, 



N. Y. Am. Jour. Sci. Ser. 3. 1886. 31:26. 



225 On the Serpentine (Peridotite) occurring in the Onondaga Salt 



Group at Syracuse, N. Y. Am. Jour. Sci. Ser. 3. 1887. 34:137 



226 RutU nach Hmenit in verSuderten Diabase Pleonast (Hercynit) 



in Norit von Hudson-Fluss. Perowskit in Serpentin (Peridotit) von 

 Syracuse, N. Y. Neues Jahrbuch. 1887. 2:263. 



227 On some Remarkable Crystals of Pyroxene from Orange County 



N. Y. Am. Jour. Sci. Ser. 3. 1887. 34:275 



228 Contact Phenomena of the Cortlandt Series near Peekskill, N. Y. 



Am. Jour. Sci. Ser. 3. 1888. 36:254. 



229 On the possibility of Hemihedrism in the Monoclinic Crystal 



System; with especial Reference to the Hemihedrism of Pyroxene. Am 

 Jour. Sci. Ser. 3. 1889. 38:115. 



230 Amphibole, St Lawrence County, N. Y. Am. Jour. Sci. Ser. 3. 



1890. 39:352. 



231 Williams, S. G. Geological Relations of the Gypsum Deposits in Cayuga. 



County, N.Y. Am. Jour. Sci^ Ser. 3. 1885. 30:212. 



Other authorities 

 a American Museum of Natural History 

 b Brooklyn Institute, mineral collection 

 c Columbia University, Egleston Mineralogical Museum 

 d Hamilton College Museum 

 e New York State Museum 

 / Union CoUege Museum 

 ^ Mr E. C. Eckel 

 h Mr Gilbert van Ingen 

 j Mr W. W. Jefferies 

 k Prof. J. F. Kemp 

 I Mr H. O. Clough 

 m Dr F. J. H. MerriU 

 p Mr H. S. Peck 

 w The author 



