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these experimental treatments is attached hereto. In this summary the treatment given each group of runs is indicated and under this is given the average absorption in volume per cent for each run, also the average absorption in volume per cent for the group. It will be noted that the perforated ties, given the same treatment as the non-perforated, in general, show a much higher absorption in volume per cent. This is due to perforations permitting solution to penetrate the sides of the ties as shown in the following illustration of un-perforated and perforated ties.

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In these photographs the potassium ferrocyanide uranium acetate visual test has been applied, the dark portions indicate that portion of the wood to which the zinc chloride solution has not penetrated. The immense improvement in the treatment of Douglas Fir due to perforations may be seen by referring to the following photographs.

It appears from our experimental treatments that seasoned perforated fir ties were treated to refusal when the pressure, gradually increased to 175 pounds in 1 hour and 30 minutes, had been held 4 hours, and non-perforated ties, when the pressure, increased to 175 pounds, in 1 hour and 30 minutes, had been held 5 hours.

DOUGLAS FIR, BURNETT-CHLORIDE ZINC

SUMMARY OF TREATMENT

(Treatments Shown in Columns Is Treatment Given Groups Shown Below)

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18.89

24.23 20.95 25.24 24.87 28.73 22.49 25.82 26.35 23.33 27.46 27.14 24.87 26.67 18.99 22.28 23.86 21.85 31.59 23.23

19.21

28.46

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26.03 24.97

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General Average.

23.28 21.65 21.61 24.55 23.36 26.74

24.44 25.82 22.78 23.33 27.96 27.14 24.87 62.67 36.25 29.18 32.11

30.85

ABSORPTION VOLUME PER CENT PERFORATED TIES-14 INCHES, CENTER TO CENTER

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NOTE-Ties in Group No. 8 received 30 Lbs. Steam instead of 20 Lbs.
Office Manager Treating Plants, Topeka, Kan., September 30, 1921.

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