Aa 
Ment held good. In 18 
_ Ment: 4, however, Voge 
_ Asiatic basalt, and, in 1876, 
b =: 
4 «Sea U. S. Geological Survey 
a mentary on the influence of modern scien 
^ name so given. 
7 vol ‘ : . . 
cano “ Cerro de las Virgines” in 
PERERA Dr chine eae San 
Re eaters eee MY E 
mig] Mineralogy. 1259 
Gidari ; i ; 
enn, and the lower Kimmeridge or Astartian are 
seamed neuropterous insect (Æschna flindersiensis), 
a G ites and five molluscan species, including an Avicula 
= K ee. have been described by Dr. H. Woodward and 
ices. eston from the Cretaceous of Australia (Geol. Mag., 
MINERALOGY.’ 
— The history of leucite is 
rs ago Humboldt made the 
Isang found it in an 
: Zirkel announced its discovery in 
oe Territory, U. 5. 
Although the leucite was invisible to the naked eye, Zirkel’s 
overy was regarded so important that the locality was named 
the Leucite Hills, An interesting. 
ce is furnished by 
by Von Chrustschoff? who finds it in a lava in 
Gass of an ash-gray ground-mass Sp inkled wit 
of 15 of brownish-black obsidian or glass, and with light specks 
rou DEW These light specks are $ own by a lens to have a 
Shins ed octagonal outline. i jvine also occur por- 
yritically, and in the grondmass plagioclase, magnetite, nephe- 
‘ ei ted by Professor H. CARVILL Lewis, Academy of Natural Sciences, Phila- 
Min. u. Petrograph. Mitth., 1884, VI, 160. 
