112 



THE ROYAL SOCIETY OF CANADA 



Samples 3 and 4 are different trees cut sometime in the Autumn, 

 allowed to lie outside in the weather until April and then cut to size 

 and dried at a temperature of from 20 to 30 deg. centigrade for three 

 weeks and then distilled. Sample number 4 contained a portion of 

 slightly rotten wood. Difficulty in settling out the tar and a low 

 yield of acetic acid was noticed in this case. 



Samples 5, 6, 7 and 8 are from trees cut in the Point Grey district, 

 weathered outside for five months, and then cut to size and dried at 

 a temperature of from 20 to 30 deg. C. for five or six days. Samples 5, 

 6 and 7 are from separate trees and number 8 is a mixture of the three. 



{Fir Mill Waste) 



Samples 9 and 10 are Douglas Fir taken from a pile of slabs 

 purchased by the University in August, 1920, and piled outside until 

 April. The wood selected represents, as nearly as possible, an average 

 sample of this lot of five cords. However, neither bark nor pitchy 

 pieces were selected. Sample 9 was distilled as it came from the 

 uncovered pile while sample 10 was thoroughly dried at a temperature 

 of from 20 to 30 deg. C. for ten days. 



Samples 11 and 12 are from a two cord lot of mill waste sold in 

 Vancouver after it had been well seasoned in a wood yard. These 

 two samples represent well-seasoned fir mill waste and not water- 

 soaked slabs. Pitchy pieces and bark were a\'oided in preparing the 

 samples. 



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