PROLONGING THE SUPPLY. 



15 



Table 7 shows the results of analyses of bark of representative trees 

 of the various districts: 



TABLE 7. Analyses of bark samples from different districts. 



PROLONGING THE SUPPLY. 



With the disappearance of the bodies of tanbark oak which have 

 furnished the chief tanning material for the leather manufacturing 

 industry on the Pacific coast the question of the continuation of the 

 supply becomes very important. Since the greater portion of the 

 standing tanbark is now confined to broken and inaccessible moun- 

 tain country, the extension of transportation facilities to those 

 regions must exert a very marked influence on its exploitation and 

 cost. Railroads and wagon trails are being rapidly pushed into the 

 northern coast ranges, and it is probable that within two or three 

 years the rich belts of Mendocino, Humboldt, and Del Norte Counties 

 will have at least one railway line. The utilization of second growth; 

 the introduction of more conservative methods in the woods, par- 

 ticularly in connection with the redwood lumbering industry; the 

 protection of the forests from fire; and the extension of the use of 

 other products as substitutes for and supplements of the bark of 

 this most important tree, will all have their influences on the future 

 supply. 



