Hornhlende-Baaalt in Northern, California. — JJiller. 255 
son the following analyses are added: (No. 1) Hornblende- 
basalt from Todtenkopfchen, described by H. Sonimerlad in 
Neues Jahrbuch, Beilage Bd. II, 188'J, page 155. (No. 3) Ku- 
laite, a variety of hornblende-basalt from Kula Basin, in Lydia. 
described by H. S. Washington, in the American Journal of 
Science, February, 1894, page 122, and in "The volcanoes of 
the Kula basin in Lydia," page 57. (No. 4) Camptonite, 
from Campton Falls, New Hampshire, analyzed by L. G. 
Eakins, in the chemical laboratory of the U. S. Geological 
Survey. 
12 3 4 
SiOg 42.68 44.77 47.50 .38.45 
TiOg .53 
Al^O.^ 9.42 17.82 19.32 19.68 
Fe-^dg 11.55 5.05 4.75 4.01 
Feb.' 7.23 6.95 5.20 11.15 
MnO trace trace 
• CaO 13.15 10.38 8.37 9.37 
MgO 10.09 8.22 4.36 6.65 
Kp 1.16 .92 2.31 1.72 
NagO 2.71 2.13 7.63 2.77 
H.,6 1.06 2.64 0.46 1.49 
■■2^ 
99.05 PgOg .72 0.21 4.82 =Co.2 
Vp.^ 1.29 
TiO.3 51 100.11 100.11 100.11 
In chemical composition the California rock lies between 
that of Todtenkopfchen (No. 1) and of the Kula basin (No. 
The rock described by Sommerlad gelatinizes by hydrochlo- 
ric acid, and is reported to contain nephelite. Kulaite con- 
tains much more Na.,0, but no reaction for nephelite was 
obtained. However, a trace of leucite was found. The Kosk 
creek rock does not gelatinize. The large amount of water it 
contains is due to the serpentine. 
J. Hazard has recently described* from the Lausitz, in 
eastern Germany, an interesting series of- hornblende-basalts 
occurring in volcanic necks (Ausfiillungsmasse der Eruptions- 
canale). The surface flows (Decken) and the dikes (Gange) 
of the same region, are free from hornblende. Although many 
basalts occur in that region, all forms of them appear to con- 
tain nephelite. 
*Tscheraiak's Min. und Petrog. Mitt., vol. xiv, 1894, p. 297. 
