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. 
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. 
223 
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 verinderten 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. 1987. 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 
American Museum of Natural History 
Brooklyn Institute, mineral collection 
Columbia University, Egleston Mineralogical Museum 
Hamilton College Museum 
New York State Museum 
Union College Museum 
Mr E, C. Eckel 
Mr Gilbert van Ingen 
7 Mr W. W. Jefferies 
k Prof. J. F, Kemp 
l Mr H, O. Clough 
m Dr F. J. H- Merrill 
p Mr H.S. Peck 
w The author 
~yTaQ ro Bia 78 
