O. W. Huntington— Coahuila Meteorites. 115 
after history, to changes in the locus of the chief vent, or an 
elongation of the crater in one direction rather than another. 
The form of the Kilauea crater, and the existence of those 
steaming fissures southwest of it and others on the northeast 
_ side, suggest some such determining cause of change. The 
elongated form of Haleakala, the great crater at the summit of 
Kastern Maui, may have this explanation. 
17. Quiet after an Hruption.—A decline to a season of quiet 
follows an eruption because the preceding action had opened 
fissures, and so the crater and the upper part of the conduit had 
become emptied of lava, and, as a consequence, had also become 
chilled down to the new surface. Further, in the inactive or 
weakened condition thus oceasioned, the cooling of the conduit- 
lavas might sometimes extend to a great depth because of the 
still-continued intrusion of subterranean waters. The complete- 
ness of the quiet and the length of the interval would natu- 
rally vary with the greater or less extent of the discharge and 
of the accompanying cooling influences. An empty caldron 
will not overflow before its cracks are mended and the steam 
apparatus at work has again filled it; and it may be so badly 
cracked and the supply of heat so cut off as to fail of further 
use. ‘ 
Art. XII.—On the Coahuila Meteorites ; by OLIVER WHIPPLE 
HuntinetTon. With Plate III. 
In the October number of this Journal, appeared a descrip- 
tion by William Earl Hidden of an assumed new meteorite 
discovered by Mr. C. C. Cusick, U.S. A., near Fort Duncan, 
Maverick County, Texas. 
On reading the article referred to, the author was at once 
struck by the close resemblance of the iron described by Mr. 
Hidden to those described by J. Lawrence Smith under the 
head of Coahuila Irons; and supposed to belong to one fall, 
but found on the opposite side of the Rio Grande River from 
Maverick County. The Coahuila Irons referred to are— 
1. Sta. Rosa Sancha Estate, found in 1850.* 
2, Butcher Iron found in 1866. af 
3. San Gregorio.t - 
4, Chihuahua Hacienda de Conception.* 
* This Journal, 1855, vol. xix, pp. 160-163. 
Id., vol. xlvii, pp. 383-385. 
t1d., ii, 1871, pp. 335-338. 
