pine, from which the following conclusions are quoted:

"(1) A high degree of steaming is injurious to wood. The degree of
steaming at which pronounced harm results will depend upon the
quality of the wood and its degree of seasoning, and upon the
pressure (temperature) of steam and the duration of its
application. For loblolly pine the limit of safety is certainly 30
pounds for 4 hours, or 20 pounds for 6 hours." [Tables 3, 6, and
7.]

"(2) The presence of zinc chlorid will not weaken wood under static
loading, although the indications are that the wood becomes brittle
under impact." [Tables 3 and 4.]

[Illustration: FIG. 5.--DEFLECTON CURVES BEAM V]

[Illustration: FIG. 6.--DEFLECTON CURVES BEAM VI]

"(3) The presence of creosote will not weaken wood of itself. Since
apparently it is present only in the openings of the cells, and
does not get into the cell walls, its action can only be to retard
the seasoning of the wood." [Tables 3, 4, 5, and 6.]

[Illustration: FIG. 7.--DEFLECTON CURVES BEAM VII]


COMPARISONS.

A comparison of the results obtained with tests made on untreated timber
is interesting, and to this end Tables 2 and 3, from Circular 115,