186 
acetate are applied to newly-cut surfaces of wood and the pene- 
tration line is shown by the colour reaction. 
C. H. Teesdale, pp. 1-7, Forest Service Circular 200, U.S. 
Dept. of Agric. A record of certain tests carried out at the 
Forest Products Labratories. 
‘“‘ Commercial Creosotes with Special Reference to Protection 
of Wood from Decay,” by Carlile P. Winslow, pp. 1-38, Forest 
Service Circular, 206, U.S. Dept. of Agric. A considerable 
amount of information upon the various grades of commercial 
creosotes is presented in this paper, their different constituents 
being represented by diagrams and tables. 
treatment the arms were graded into three groups according to the 
‘he processes of season- 
creosote at about 125° F. to 140° F., without pressure, but that 
to saturate heart wood, pressure was necessary. It was also 
found that the creosote was afterwards more easily withdrawn 
from the cells of sap wood than from heart wood. The results 
indicate that sap wood should be allowed to retain 10 Ibs. of oil 
per cubic foot, whereas in heart wood 6 lbs. will suffice. Perfectly 
this circular. The conclusions arrived at appear to be—1. That a 
weaken wood of itself. Since apparently it is present only in the 
: into the cell walls, its 
action can only be to retard the seasoning of the wood. Various 
e@ Woo! with the results 
se 
L Railway Cross-ties,’’ by H. B. Eastman, 
pp. 1-21, Forest Service Circular 146, U.S. Dept. of Agric. The 
