43 
and is but one mile long by one fourth of a mile wide. It 
was covered with guano, which has been removed. A 
phosphatic mineral, Redondite, has been discovered in the 
rocks, filling crevices and encrusting fragments. Some of 
the “ bunches”’ measure forty feet in each direction. The 
origin is somewhat uncertain, but the material may have 
been derived from the leaching of the guano. The lava is 
of Quaterary age and volcanic activity is still shown in 
several of the Leeward islands. 
DEPARTMENT OF MINERALOGY. 
In charge of L. P. Gratacap. 
195. Suite of PYROXENES from New York State. These minerals 
are found in the igneous rocks and in the contact zones be- 
tween these rocks and the limestones into which they have been 
intruded. The types shown are Augites from Warwick, Mine- 
ville, Keene, Diana, and Monroe; Diopsides from Russell, De 
Kalk, Tilly Foster, Pt. Henry, Pitcairn, Cascadeville, and Sing 
Sing. To be described in vol. xiv., Trans. NV. Y. Ac. Sct. 
196. ARTIFICIAL ZINC OXIDE, massive and crystals. This forms 
on roof of furnaces used in manufacture of zinc oxide. The 
smaller crystals show good faces. Described in Amer. Four. 
Scz., Sept., 1894. 
197. TOURMALINE from Tilly Foster iron mines, Putnam Co., 
N.Y. 
198. APPARATUS FOR OBTAINING SECTIONS OF ANY DESIRED 
ORIENTATION. By means of this apparatus it is possible to 
obtain on first trial a section showing the interference figure. 
199. Group of SLAG-CRYSTALS from iron furnaces at Cornwall, Pa. 
Nos. 195-199 exhibited by Heinrich Ries. 
200. ROSOLITE. A new ornamental stone composed of Rose 
Garnet (Grossularite), Vesuvianite (yellow), and Wollastonite 
(white), Silicates of Aluminaand Lime. It occurs in a volcanic 
region, and has been produced by the metamorphosis of sedi- 
mentary rocks. Its industrial use is at once apparent. Found 
at Xalostoc, Mexico, which is the only deposit in the world. 
