26 
lasting qualities of each sort through a period of years. As a result 
of studies in the grading, seasoning, and treating of cross-arms, a 
more uniform, efficient, and economical treatment for this and similar 
classes of material has been obtained. Successful results in the open- 
tank treatment of loblolly pine mine props have shown that pressure 
is not necessary to secure a satisfactory penetration of the preserving 
fluid, provided that the material has been properly seasoned. Experi- 
ments to prove the feasibility of treating seasoned posts in the open 
tank have also reached a successful conclusion. Projects are planned 
to utilize dead and down timber in the National Forests by open-tank 
treatment with preservatives. 
Cooperative investigations have been carried on with cities to deter- 
mine the kinds of woods suitable for paving blocks, and methods of 
treating them; experimental pavements have been laid, containing 
various kinds of wood treated in different ways. 
A study has been made of the timbers employed as piling in salt 
water, and the methods in use to protect them from the attack of 
marine wood borers. In order to promote the preservative treatment 
of wood, the Service will, wherever possible, cooperate with those 
confronted by the important problems of preventing decay of timber 
on land and preventing attacks of marine borers in salt water. 
OFFICE OF PUBLICATION. 
In general this office has charge of all the editorial and educational 
work of the Service, including the technical and literary review of its 
publications. This work is distributed among five sections, as follows: 
The section of articles publishes a monthly field program of projects 
under way, and prepares special articles upon the subject of forestry 
in general and the work of the Service in particular. 
The section of education is charged with the broad work of bringing 
home the lessons of forestry through every available educational chan- 
nel, such as lectures and addresses, school instruction, and the propa- 
ganda of civic, industrial, and other associations. 
The section of review critically examines the form and substance of 
proposed publications. 
The section of printing sees through the press all the forms and 
manuscripts printed by the Service, prepares printing requests, and 
keeps all necessary record of Service printing work. 
The section of distribution has charge of the circulation of all Forest 
Service publications. Itdecides, through a familiarity with the manu- 
script, as to the distribution which shall be given each one. It directs, 
and is responsible for, the plans under which the Service mailing lists 
are made up and maintained, and supervises the general policy which 
covers the filling of requests for publications. 
[Cir. 36] 
