476 JOURNAL OF FORKSTRV 



Due to the present high prices of labor and ma- 

 Preservation terial, wood for use in mine structures of a more 

 of or less permanent character should be creosoted. 



Mine Though the best results are obtained from pres- 



Timbers sure processes, open-tank or brush treatments 



give economical returns in many situations. In 

 the open-tank method of treatment, woods that are refractory to treat- 

 ment should be immersed in a hot bath of creosote (150° to 200° F.) 

 for one hour, and one hour in the cold bath (100° F.) for one inch of 

 the largest cross-section. More easily impregnated woods require 15 

 minutes for each inch of the largest cross-section. Wood that is to be 

 treated by this method must positively be seasoned until air-dry. Un- 

 derground conditions in zinc mines do not warrant the use of creosoted 

 timber except in special cases. 



B. L. G. 



Economic Importance of Wood Preservation. Engineering and Mining Jour- 

 nal, December 8, 1917, pp. 985-988. 



The rustic beauty of log buildings has led to 

 Wood- the erection at various times of very pretentious 



destroying structures, the largest of which is the Museum of 



Fungi the University of Washington at Seattle, Wash., 



Resist which served as the forestry building during the 



X-rays Alaska- Yukon-Pacific Exposition in 1909. Due 



to the large sizes of logs used in this building, it 

 was expected to remain as a permanent structure. Rapid decay caused 

 by Fomcs pinicola and Poly poms schivcinitzii has made it evident that 

 this building is destined to have a comparatively short life. Various 

 attempts have been made to treat the logs to prevent further decay, 

 with no success. The logs were not treated in any way before the erec- 

 tion of. the building. Recent experiments with X-rays, submitting the 

 wood to an erythematic dose, repeated as much as fifty times, failed to 

 afifect the growth of the fungus. Ultraviolet rays, long continued, also 

 gave negative results. 



B. L. g; 



The Effect of Roentgen and Ultraviolet Rays upon Fungi. Phytopathology, 

 VII, December, 1917, pp. 426-431. 



