Personal and Scientific Neivs. 333 
been for a long time observed, and sometimes of so pro- 
nounced a nature tbat timbers after a few years are found 
so out of place as to require a complete new timbering of 
portions of a mine, and these movements do not seem to be 
the result as in coal mines of a creeping from excavation of 
material, but actual slipping or faulting movements of the 
mountain itself along certain lines, especially old fault planes 
and veins, the latter gencrall\' oc'cupying' fissures along fault 
lines. 
A notable instance is in the mines of Smuggler mountain, 
at Aspen, Colo., where in some of the deep workings, timbers 
two feet thick and eight to ten feet long placed across the 
stopes are snapped in two like reeds and their ends broomed 
up by the overwhelming pressure and slipping movements 
of the walls. The ore bodies lie between strata almost ver- 
tically uptilted against a granite mountain or wall, and 
abound in faults and slipping planes. These movements are 
not the result of excavation of the ore, but appear to come 
from a general movement of the hills slipping or faulting off 
from the granite wa'Jl. — Mines and Minerals, of Scranton, 
Pa., for September, igoi. 
Field Columbian Museum Sixteenth Free Lecture 
Course, Autumn, 1901. A course of nine lectures upon 
Sdience and Travel has been arranged by the Museum for 
Saturday afternoons in October and November at the usual 
hcur, 3 o'clock. All of these lectures will be illustrated bv 
stereopticon views. The lec'tures are given in the Museum 
Lecture Hall. Entrance doors will be closed at ten minutes 
past 3 o'c'lock. Admission free. Subjects, dates and lectures: 
( )ct. 5, The Afegalithic Monuments of Brittanv, Dr. George 
A. Dorsey, Curator, Department of Anthropology, Field 
Columbian Museum; Oc^c. 12, Through the Arizona Can.on 
and Yosemite to the Glaciers of Alaska, Dr. Edward Burton 
McDowell. Chicago; Oct. 19, The Houses and Family Life 
Cif the Natives of Sarawak, Borneo, Dr. Alfred Cort Haddon, 
F. R. S., F. Z. S., University of Cambridge, England ; Oct. 
26. The Ceremonial and Secular Dances of the Papuans, D;. 
Alfred Cort Haddon, F. R. S., F. Z.'S., University of Cam- 
bridge, England ; Nov. 2, Economic Geology, Particularly of 
Michigan, in its Relation to the Business World, Prof. Al- 
fred C. Lane, State Geologist, Michigan; Nov. 9, Color in 
Nature, Prof. \\'illiam H. Dudley. Platteville, Wisconsin ; 
Nov. 16, Mexico, Dr. S. E. Meek, Assistant Curator, Depart- 
ment of Zcclogv, Field Columbian Museum; Nov. 23, Re- 
cent Dinosaur Discoveries, Mr. Elmer S. Riggs, Assistant 
Curator of I'aleontolog}', Field Columbian Museum ; No/. 
30, Crystals, Prof. O. C. Farrington, Department of Geolog}-, 
Field Cohnrbian MiL>-eum. 
