the vats (heavy leather) 11.45 0.37 3.31 49.85 35.02

The following table shows the amount of leather produced by different
tannages of 100 pounds of hides:

Pounds.
Hemlock 255.7
Sumac 248.1
Pine 240.3
Quebracho 232
Chestnut 219.9
Oak 213.9
Laurel 210.6
Oak, lasting three years 206

It is important to mention here the large proportion of resinous matter
hemlock-tanned leather contains. This resin is a very beautiful red
substance, which communicates its peculiar color to the leather.

We should mention here that in these calculations we assume that the
hide is in a perfectly dry state, water being a changeable element which
does not allow one to arrive at a precise result.

These figures show the enormous differences resulting from diverse
methods of tanning. Hemlock, which threatens to flood the markets of
Europe, distinguishes itself above all. The high results attributable to
the large proportion of resin that the hide assimilates, explain in part
the lowness of its price, which renders it so formidable a competitor.
One is also surprised at the large return from sumac-tanned hides when
it is remembered in how short a time the tanning was accomplished,