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the percentage of moisture until the strength becomes less 
than half that of well-seasoned wood when the moisture con- 
tents amount to 25 per cent. of the dry weight. From this 
point on the diminution in strength will further increase 
in moisture is much less marked. With 10 per cent. of 
moisture the average crushing strength is 4,600 lbs. per sq. 
inch, at 25 per cent. it has fallen to 2,250, and at 50 per cent. 
moisture it indicates a strength of 5,600 lbs. per sq. inch, and 
at 25 per cent. a strength of 2,750, a little less than half, 
