614 THE AMERICAN NATURALIST. (VoL XXXII. 
1 to 1. The results of the investigations are exhibited in several 
diagrams, which show in a remarkable manner the relations between 
the chemical and the mineral composition of a large number of rocks. 
California. — Massive flows of a rock intermediate in composition 
between trachytes and andesites are associated with the andesitic 
tuffs and breccias in the Sonora and Big Trees quadrangles of the 
Sierra Nevada, California. The rocks, according to Ransome,’ are 
characterized by a high percentage of alkalies with potash in excess 
of soda. The author describes them under the name latite, possess- 
ing large phenocrysts of plagioclase and a few anhedra of pale-green 
augite in a compact aphanitic base. Under the microscope idiomor- 
phic olivines are also discovered. The groundmass is a hyalopilitic 
aggregate of labradorite, augite, and a globulitic glass, magnetite, 
and apatite. Biotite phenocrysts are present in some specimens. 
The fact that the analyses of all specimens show the presence of con- 
siderable potash, while at the same time no potash-bearing mineral 
has been observed in them, suggests that the residual glass is very 
rich in this-oxide. Analyses of the augite-latite from Tuolumne, Table 
Mt., and of the biotite-augite-latite from near Clover Meadow follow : 
SiO, TiO, Al,O; FeO, FeO MgO CaO Na,O K,O H20 P20; 
sso 19 .64 16.76 3.05 4.18 3.79 6.53 2.53 4.46 1.00 .55 
Biot.-au.-latite 62.33 1.05 17.35 2.98 1.63 1.05 3. 23 4.21 4.46 1.19 .29 
besides small ers of a. BaQ, SQ,, LLO, and.C 
These rocks are the effusive equivalents of the monzonites. They 
differ from andesites in possessing a large percentage of the alkalies 
with potash predominating. They differ from trachytes in containing 
no sanidine. They are closely related to the vulsinites, ciminites, 
and other rock types described abroad. The term latite is proposed 
to include all the effusive forms of monzonite, leaving vulsinite, cim- 
inite, etc., as terms for varietal forms. It is nearly equivalent to 
Washington’s term trachy-dolerite. The dike rocks corresponding 
to the latites may be the banakites of Iddings. 
Nodular Granite, Ontario. — A peculiar occurrence of nodular 
granite has been found by Adams? in the township of Cardiff, Peter- 
borough County, Ontario. The granite is a fine-grained reddish 
rock banded by streaks of different degrees of coarseness. The 
nodules are spherical or elliptical, with diameters varying from one 
1 Amer. Journ. of Sci., vol. v, p. 355, 1898. 
2 Bull. Geol. Soc. Amer., vol. ix, p. 163. 
