BORDKRKD PITS IN DOUGLAS l-'IR Si; 



Up the mountain slope in the Snoqualmie National Forest, Washington, 

 were examined. Both heartwood and sapwood material were examined 

 whenever possible, and the results are shown in Table 2. The investi- 

 gation disclosed a marked tendency, in both the heartwood and sapwood, 

 toward the aspiration of the tori of the pits — that is, in both the spring- 

 wood and summerwood the majority of the tori were displaced from 

 the central position. 



Oven-dry Material. — One specimen of coast or lowland-grown ma- 

 terial oven-dried (bone dry) from the green condition was examined, 

 and the results are given in Table 3. The general condition of displace- 

 ment or aspiration of the tori noted in Table 2 was found here also. 



THE POSITIOX OF THE TORI IN CREOSOTED DOUGEAS FIR WITH RELATION To 

 THE ABSORPTION AND PENETRATION OBTAINED 



Green Material. — In the green coast or lowland-grown material, from 

 western Washington, that had been treated with creosote the heartwood 

 of four specimens was examined with results shown in Table 4. 



It is to be noted that when the absorption and penetration were rated 

 as good the majority of the summerwood tori were in the central posi- 

 tion in the pit cavity. 



Crcosoted Air-dry Material. — The largest number of pits studied in 

 one group (296) was in the creosoted air-dry material. One specimen 

 of lowland-grown fir and nine specimens of mountain-grown were used. 

 The results appear in Table 5. It is to be noted that the record of the 

 mountain fir showed that the treatment obtained was uniformly poor. 

 In fact, in the specimens studied, with one exception, no penetration 

 beyond one cell (tracheid) length, about 1/6 inch along the grain, was 

 noted. 



The tori in the mountain-grown material in all these air-dry speci- 

 mens showed a tendency to occupy positions other than the central one 

 in the pit cavities. 



In one mountain-grown specimen, Ship. 466, tree No, 48, a specially 

 selected portion from near the surface of a piece of this material, which 

 showed about Yz inch tangential penetration, was examined. Where 

 the penetration had occurred in the summerwood, the great majority of 

 the tori were in the central position in the pit cavity. In the majority 

 of cases in mountain-grown material the treatment was poor or wholly 

 lacking, and the tori were for the most part aspirated. 



In the one specimen of lowland fir which was well creosoted, the 

 great majority of the summerwood tori were centrally located. 



