24 BULLETIN 1168, U. S. DEPARTMENT OF AGRICULTURE. 
Acid tannage. — Leather from the acid tannages did not wear quite 
as long as that from the nonacid tannages. For several reasons, 
however, this is not regarded as conclusive. 
Section of the bend. — The average wear per 9 irons for soles from 
the shoulder end of the bend was 79 days, as against 85 days for those 
from the butt end. These indications are in harmony with practical 
experience and with other experiments on leathers from the different 
sections of the hide. \i 
The outstanding indications from this investigation are: (1) The 
superior pliability of retanned chrome and chrome-tanned upper 
leathers; (2) the objectionable features of fiber soles and the long 
wear of those that did not develop such features; (3) the increased 
serviceability of rolled vegetable-tanned sole leathers; and (4) the 
strikingly longer wear of chrome-tanned sole leathers, especially of 
the unwaxed chrome-tanned leather. 
