Qualities and Uses of the Woods of Ohio 
89 
after the fourth and so on until the last interval which was only one 
week in duration. 
Immediately after the last weighing wdiich determined the water 
absorption for the whole period, the samples were placed in a dry¬ 
ing oven and so arranged that each should get, as nearly as pos¬ 
sible, the same amount of heat. At the end of 24 hours in this drying 
I 
oven they were removed and weighed, and this was repeated at in¬ 
tervals of 48 and 72 hours respectively. This was done in order to 
determine whether the species that absorbed water most rapidly 
would also give it up most rapidly. 
Fig. 9. Students sawing and splitting cottonwood and willow for shipment to 
a paper and pulp mill. 
After the samples had been allowed to dry in the air of the room 
for one month, they were again submerged in water and the results 
noted as before. 
NOTES. 
One (1) liter is equivalent to one (1) cubic decimeter. 
One (1) gram is equal in weight to one (1) cubic centimeter of 
distilled water. 
One (1) pound equals 0.4536 kilograms. 
One (1) cubic foot equals 28.32 cubic decimeters. 
0.4536 divided by 28.32 equals 0.016017, a factor which multi- 
