354 THE AMERICAN NATURALIST. 
the same region, melaphyres, melaphyre-tuffs, granites, amphibolites, 
and contact metamorphosed limestones have also been identified. 
Becke ' records an analysis of the leucite-basanite lava of 1891-93 
from Vesuvius as follows: 
SiOz Al203 FeO Fe0O0; CaO MgO Na2O KO P20; Total. 
wey TUGI -GO AG GaS 202 e B17 Goe gg = Troy 
The tonalite gneiss of Wistra, Carpathia, has the composition : 
SiO, ALO Fe2O0 FeO -MgO CaO Na0 KO Loss. Total. 
63.09 1889 3.48 2.02 17 AB 58‘: as 69s Se oe re 
Coleman ° gives a few brief descriptions of some of the rocks met 
with in the course of his studies of the gold regions of Western 
Ontario. Among them are diorites, diorite gneisses, a porphyrite, 
a pyroxenite, and a hornblende porphyrite from Grand Presque Isle, 
Lake of the Woods. The hornblende porphyrite consists of pheno- 
crysts of hornblende, containing in their interiors remnants of augite 
and a ground mass composed of quartz, plagioclase, augite, and some 
orthoclase. Near Peninsula and Port Caldwell, on the north shore 
of Lake Superior, are coarse diabases, gabbros, augite-diorite, and 
porphyrites, and associated with them are red rocks, called by the 
author augite-syenites, diorites, and syenites. Some of the augite- 
syenites are aggregates of orthoclase and augite, while others are 
made up largely of pegmatite. Near Lake Wahnapital, in the Sud- 
bury district, diabases, epee arkoses, graywackes, and dolomites 
occur. 
1 Min. u. . Petrog. Mitth., vol. xviii, 
2 Rep. Bureau of Mines (Ontario), ‘ob p- 145. 
