28 
BULLETIX 606, U. S. DEPARTMENT OF AGRICULTURE. 
Sycamore (Platanus occidental?*). — Tyloses occurred scatteringly 
in the specimens of sycamore treated. Penetration was found to take 
place mainly through the vessels. Very little creosote was found in 
the wood prosenchyma or parenchyma. The wood was difficult to 
treat in either the penetrance apparatus or in the cylinder. Complete 
penetrations in the impregnation tests were not obtained, even at 
pressures of from 125 to 150 pounds per square inch. The difficulty 
in treating this species seems to be clue largely to the t3 T loses and to 
the cross-grained structure of the wood. 
Willow, black (SaJix nigra) — heartwood. — Knots in the wood made 
it difficult to get good clear specimens of willow. Specimens treated 
in the cylinder showed fairly good penetrations for most of the pres- 
sures used. Tyloses are scattered in both sapwood and heartwood. 
The tyloses in the vessels did not prevent penetration. Creosote was 
found to be present to a considerable extent in both the vessels and 
the wood prosenchyma. 
Table 2, — Species in the order of amount of absorption, 1 and comparative longi- 
tudinal and radial penetration. 
Character of 
wood. 
Impreg- 
nation 
tests. 
Penetrance tests. 
Average 
dry 
weight 
per 
cubic 
foot. 
Species. 
Average 
time 
of treat- 
ment. 
Time required 
to penetrate 
24 inches. 
Average 
longi- 
tudinal 
penetra- 
tion. 
Average 
radial 
penetra- 
tion. 
Heartwood 
Ho 
Lbs. per 
cu.ft. 
2.03 
3.40 
5.39 
5.57 
7.18 
7.32 
8.48 
8.54 
9.86 
10.09 
11.61 
12.19 
12.83 
14.92 
15.20 
15.46 
16.24 
16.28 
16.29 
17.27 
17.85 
17.97 
18.20 
18.33 
18.83 
19.78 
20.36 
20.90 
25. 09 
25.21 
Minutes. 
70 
Minutes. 
Inches. 
1. 35 
2.32 
.50 
.61 
7. 66 
4.00 
4.17 
10. S3 
6.06 
5.33 
8.16 
Inches. 
0.09 
.08 
.05 
.05 
.33 
.IS 
.23 
.33 
.38 
.20 
.45 
Pounds. 
38.8 
45.3 
40.8 
40 8 
70 
70 
70 
70 
70 
70 
70 
70 
45 
75 
2to 5 
38 6 
6. Chestnut : do 
25 4 
35 
8. Hackbeny do 
9. Hickory, "mock- do 
ernut. 
10. Sugar maple do 
11. Hackbeny Sapwood 
3S 2 
52 3 
43 7 
1 
35 8 
47 8 
13. Red oak 2 do... 
39 7 
14. White - heart do 
70 
70 
70 
7C 
70 
70 
70 
IS. 80 
.24 
.30 
.27 
( 3 ) 
.25 
■2 
.4o 
43 
beech. 
15. Yellow birch — do 
16. Red birch do 
Immediately.. 
25 to 35 
' 10. 39 
8. 36 
4. S7 
6.23 
8 c l 
44.3 
39.2 
20 
18. Larg e t oot h do 
aspen. 
19. White elm do 
45 
27 8 
34.2 
20. Green ash do 
21 . Slippery elm 2 do 
22. Silver maple do 
Immediately.. 
10. 61 
3S.3 
27 3 
70 
70 
70 
70 
70 
70 
70 
70 
45 
3. 52 
.30 
.30 
.33 
.46 
( 3 ) 
.30 
( 3 ) 
(*} 
36.0 
23. Sweet birch do 
24. Red gum Saowood 
( 4 ) 
3.85 
12.96 
S.16 
11.17 
12.11 
9.91 
10.72 
46.9 
36.7 
25. White ash Heartwood 
4 to 7 
34.3 
26. Silver maple Sapwood 
30to60 
7 to 12 
32.8 
31.0 
2^. Tupelo gum do 
20 
34.8 
29. Wild red cherrv do 
23.7 
30. Tupelo gum .... Sapwood 
22to25 
12.33 1 (») 
33.5 
i The absorption tests wore made in the treating cylinder and in most cases better penetrations were 
obtained in the species which took the higher absorptions. The pressures and times used in these-tcsts 
are not comparable to commercial conditions. 
' Not treated in the penetrance apparatus on account of the open condition of the pores. A good pene- 
tration was secured in tests made in the treating cylinder. 
3 Complete. Since the radial penetration of tupelo gum, wild red cherry, black willow, and silver maple 
was complete the relative order of those species is not important. 
* Specimens were not straight grained, and oil passed out at the side. 
