WOOD 53 
The cutting of the trees is usually done in winter, 
the floating of the logs, or river driving as it is called, 
beginning with the breaking up of the ice in the spring. 
River driving is a very interesting and dangerous busi- 
ness. Logs will often get caught sidewise and the whole 
river from shore to shore become jammed so tightly 
Fic. 65. A Skidway of Adirondack Spruce 
that hundreds of thousands of logs are stopped in their 
course, forming an immense dam which the lumbermen 
call a log gam. 
To break up this jam very often requires much labor 
and great daring on the part of the drivers, who wear 
