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. 11273. 



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



Am. Jour. Sci. Ser. 3. 1884. 28559. 



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 56. 



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



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



226 Rutil nach Ilmenit in veranderten Diabase Pleonast (Hercynit) 



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

 Syracuse, N. Y. Neues Jahrbuch. 1887. 2563. 



227 On some Remarkable Crystals of Pyroxene from Orange County 



N.Y. Am. Jour. Sci. Ser. 3. 1887. 34575. 



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



Am. Jour. Sci. Ser. 3. 1888. 36554. 



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 v 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 

 r e New York State Museum 



/ Union College Museum 



g Mr E. C. Eckel 

 [h Mr Gilbert van Ingen 



i Mr W. W. Jefferies 



k Prof. J. F. Kemp 



I Mr H. O. Clough 

 m Dr F. J. H. Merrill 



p Mr H. S.^Peck 

 w The author 



