UTILIZATION OF CALIFORNIA EUCALYPTS. 95 
is particularly true of young, rapid-grown trees. Sawed posts or 
poles or split posts, consisting largely of heartwood, would undoubt- 
edly give better results. However, trees large enough to make 
sawed poles will probably be of more value for other purposes, and 
it would be very difficult to split posts. Red and sugar gum are more 
durable than blue gum. It is probable that blue-gum posts with 
a creosote preservative treatment can be made equal or superior 
to redwood in durability. At the present price of redwood posts, 
however, it is a question whether such treatment would save money. 
For poles a preservative treatment costing from $1.50 to $3 will 
Fic. 6.—A ferry slip, San Francisco, Cal., constructed of blue-gum piles. 
probably make eucalyptus more durable than the untreated cedar 
and redwood now employed. Eucalyptus is so heavy, however, 
that the extra expense in handling would, in all likelihood, render 
the cost of the treated pole in the line too great to justify its use 
under present conditions. As the supply of cedar and redwood fails 
this condition may be changed. 
The eucalypts are well fitted in form and strength for use as 
marine piles. An investigation of the condition of -piling in Pacific 
coast waters demonstrated that blue gum is more durable than 
other untreated woods that are commonly used. Eucalyptus piles 
[Cir. 179] . 
