U. S. GEOLOGICAL SURVEY 
BULLETIN NO. 324 PL. XLII 
A. ROOF TRUSSES DAMAGED BY HEAT, THROUGH FAILURE OF TERRA-COTTA COVERING, 
MUTUAL LIFE BUILDING, SAN FRANCISCO. 
Photograph by Richard L. Humphrey. 
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];. EFFECT OF SETTLING OF GROUND SUBJECTED TO EARTHQUAKE VIBRATIONS. 
STEEL-FRAME BUILDING UNDER CONSTRUCTION. 
The concrete basement walls were not reenforced. Post-office in the background. Photograph by 
Richard L. Humphrey. 
