822 JOURNAL OF FOKl•;sTu^• 



CONCLUSIONS 



1. A considerable number of the summerwoocl tori in both the sap- 

 wood and heartwood of the mountain-grown specimens of Douglas fir 

 were already aspirated in the green wood. This was not true in the 

 lowland specimens. 



2. In the air-dry sapwood and heartwood of the mountain-grown 

 material a still larger proportion of aspirated tori in both spring and 

 summerwood were found (Table 2). In the air-dry heartwood of the 

 lowland material (Table 5) aspirated tori were noted in the spring- 

 wood, but in the summerwood the tori were all in the central position. 



3. Oven-drying tended to increase the number of aspirated tori in 

 both mountain and lowland specimens. 



4. Creosoted specimens showed a fair to good penetration, espe- 

 cially in the summerwood in the lowland, but very poor or practically no 

 penetration in the niountain-grown material. Lack of penetration 

 coincided directly with the number of tori aspirated. 



5. Treatments of air-dried material with air and steam caused no 

 apparent displacement of the tori from the position held in matched 

 untreated pieces from specimens. 



6. Green lowland-grown material soaked in alcohol and then oven- 

 dried showed the tori in the same positions after treatment that they 

 held when the wood was in the green condition — that is. they did not 

 become as]iirated on drying, as did the tori in the specimens not treated 

 with alcohol. 



