CXIV THE ROYAL SOCIETY OF CANADA 
very good grades of blotting paper have been produced on the experi- 
mental paper machine. 
8. Pulpwood. The object of this investigation is to study 
the feasibility of barking, chipping, drying and baling pulpwood near 
the logging operations and shipping the bales to the mills for the 
manufacture of chemical pulp. In connection with this work it was : 
necessary to determine such data as average weight green and dry 
of a cord of rough pulpwood, loss on rossing, weight of a full cord 
of peeled wood, volume of solid wood per cord, yield of good chips 
from a cord of pulpwood, weight of chips loose and packed per cubic 
foot, rate of air drying of chips, shrinkage on drying, etc. This infor- 
mation should be of practical interest to the pulp and paper industry. 
Preliminary baling experiments have been made and this problem 
together with the commercial drying of pulpwood chips is in the hands 
of one of the companies with whom we are co-operating. 
9. Durability of wood. The lack of definite information re- 
garding the natural durability of the important commercial species 
of Canadian woods is a handicap in selecting timber for various 
structural purposes. Plans are now in hand for a study of the rela- 
tive durability of a few Canadian tree species. This work will 
include accelerated rotting tests of wood specimens and other 
laboratory studies to determine the susceptibility of untreated woods 
to fungus attack. 
10. Railway ties. This investigation is intended to cover the 
problems relating to preservative treatment of railway ties under 
Canadian conditions. The plans include experimental treatment 
of tie timber and service tests of treated ties in track. A considerable 
amount of preliminary work has been completed during the year and 
the problem has been taken up in co-operation with officials of the 
Canadian railroads. 
11. Paving blocks. The merits of treated wood-block paving 
for city, streets and factory floors and the abundance of raw material 
in Canada points to a greatly extended use of wood for paving purposes 
in the future. These laboratories have in mind a continuous investi- 
gation of this subject, involving experimental preservative treatment 
of wood-block material and service tests of treated blocks. Con- 
siderable information has been gathered and a general discussion was 
given in Forestry Branch Bulletin 49, ‘““Treated Wood-Block Paving.” 
A number of inspections have been made of wood pavements in Cana- 
dian cities during the past year. A supply of Norway pine has been 
procured for laboratory tests on this promising species. 
