O. A. Derby—Santa Catharina Meteorite. 33 
5 I. 
SiO, 41°837 42°043 
FeO 2°234 3°663 
MgO . 41°990 39°540 
H.O 14°282 14°309 
100°343 99°555 
These analyses establish clearly the identity of this mineral 
with the chrysotile from other localities, as can be readily con- 
rmed by comparing them with the analyses already published. 
Chemical Laboratory of Beloit College, Beloit, Wisconsin, Nov. 28, 1884. 
Art. IX.—The Santa Catharina Meteorite; by ORVILLE 
A. DERBY. 
Havine recently undertaken, in company with Mr. Luiz 
Gonzaga de Campos, an examination of the Brazilian meteorites 
preserved in the National Museum of Rio de Janeiro, in which 
that gentleman has taken charge of the chemical and I of the 
i part of the work, I have had occasion to make the 
ollowing observations on the somewhat famous Santa Cath- 
arina meteorite which seem to be of suflicient importance to 
warrant publication in advance of the more extended general 
memoir that we are now preparing. 
_M. Daubrée, who has so thoroughly studied the metallic por- 
tion of this meteorite, mentions an ochreous crust in some of. 
the Specimens* which he took to be of secondary and terres- 
trial origin, and to be composed of a mass of limonite resulting 
Tom the oxidation of the iron, together with imprisone : 
ments of the disintegrated granite on which the mass was 
Stated to have rested. Misled by this conclusion (a very 
natural one if, as is to be presumed, the crust on the specimens 
examined was partially decomposed), he devoted all his atten- 
tion to the metallic elements with the brilliant results that are 
* 
80 well known. This crust, however, when examined on well 
. Comptes Ren vol. Ixxxiv. 1508. Etudes synthéti de Géologie 
; if Dh 5 ynthétiques é 
Expérimentale, p. ne 4 
Am, Jour. Sc1.—Turrp Series, Vou. XXIX. No. 169.—Jan., 1885. 
3 
