24 Fietp CotumpiaAn MustumM—GEo.ocy, VOL. t. 
cally in an amorphous or crypto-crystalline ground. The occurrence 
and association of these minerals is similar to that in the eruptive 
rocks of the earth, and these they closely resemble. Representatives 
of many of the different varieties of eruptive rocks can indeed be 
found among the aerolites,so that, in the view of Wadsworth, no 
distinctions in classification should be made between rocks of terres- 
trial and extra-terrestrial origin if they resemble one another in con- 
stitution. Thus the aerolites containing no feldspar and made up 
chiefly of chrysolite are classed by him with the peridotites, the dif- 
ferent varieties finding representatives as follows:—Dunite, a rock 
made up chiefly of chrysolite and chromite, is represented by the 
meteorite of Chassigny; saxonite, composed of chrysolite and ensta- 
tite, by those of Homestead (313) Knyahinya (284) and Waconda (389) ; 
lherzolite, made up of chrysolite, enstatite and diallage, by those of 
Pultusk (289) and New Concord (274). 
Sinularly the aerolites containing feldspar may be considered as 
corresponding to the basalts and gabbros in mineralogical constitu- 
tion; basalt, made up of augite and anorthite, finding a representative 
in the stones of the Stannern (225) fall; gabbro, composed of anor- 
thite and enstatite, in the meteorite of Juvinas (237). 
While such a grouping is convenient for keeping in mind the 
mineral constitution of the different aerolites, it is doubtful whether 
its application should be pushed much farther, since the distinction 
of origin is one of considerable importance. 
The classification suggested by Tschermak* for the aerolites is 
as follows: 
I. Aerolites made up of chrysolite and bronzite with iron subor- 
dinate, texture mostly chondritic. (L’Aigle, Knyahinya, New Con- 
cord, Pultusk, etc.) 
II. Aerolites made up chiefly. of chrysolite or bronzite or other 
pyroxene. 
(a) Chassignite, composed mostly of chrysolite. (Chassigny.) 
(b) Amphoterite, composed of chrysolite and bronzite. (Man- 
bhoom.) 
(c) Diogenite, composed of bronzite or hypersthene. (Ibben- 
buhren, Shalka.) 
(d) Chladnite, composed of enstatite. (Bishopville). 
(ec) Bustite, composed of diopside and enstatite. (Busti). 
III. Aerolites made up of augite, bronzite, and lime feldspar and 
having a shining crust. ! 
(a) Howardite, composed of augite, bronzite and plagioclase, 
(Frankfort, Lontolaks.) 
(b) Eukrite, composed of augite with anorthite or maskelynite. 
(Juvinas, Jonzac, Stannern, Peterborough.) 

*Ber. Ak. Wien., Bd. 88, pp. 347, 371, 1883. 
