6 FIELD CoLUMBIAN MuseEuM—GEo.ocGy, Vout. III. 
however, is considerably stouter in habit than that in Bella Roca. 
The chief point of difference between the two irons, however, and 
one which in the writer’s view seems alone to warrant their separa- 
tion, is that in Rodeo there is an entire lack of the inclusions of 
troilite which form so striking and important a feature of the compo- 
sition of Bella Roca. Although eight full-sized sections have been 
made of Rodeo, no troilite has as yet been observed in it. In Bella 
Roca, however, as is well known, troilite is an abundant and charac- 
teristic constituent. The chemical analyses of the meteorites do not 
show important differences, but this would not be expected as between 
medium and fine octahedrites. Still the analyses show a relative 
absence of sulphur and hence of troilite, and abundance of phos- 
phorus and hence of schreibersite in Rodeo, while the opposite condi- 
tion holds in Bella Roca. The analyses compare as follows, that of 
Bella Roca being by Whitfield :* 
Fe Ni (Con ea P S) C 
Bella Roca.. 91.48 7.92 0.22! —— 0.21 0.21 0.06 ==5oG,1e 
ROGGSG Stay 89.84 8.79 0.28 0.07 0.80 0:02 6.69 ==" ogee 
In view, therefore, of the distance between the localities and the 
difference in structure and composition, there seems to be sufficient 
reason for regarding Rodeo as a distinct fall. 
eA rigs | OUTL SCle6sy. 3 7a eat sOs 
