Periodical Literature 145 



Durability 

 Name of Timber In Soil In Air 



Cedar 20 years 



Chestnut '..... 12 



Cypress 20 20 years 



White oak 10-15 15 



Longleaf pine 10 12 



Douglas fir 8 16 



Tamarack 8 10 



White pine 7 10 



Spruce 7 10 



Norway pine 6 10 



The Southern Pacific Railroad has 105,000 creosoted Douglas 

 fir piles in trestles, of which two thirds are over 12 years old, 

 ranging up to 23 years; not more than 500 have been taken 

 out on account of decay. O. L. S. 



Canada Lumberman and Woodworker, November, 1913. 



A series of interesting experiments in 



Treatment the treatment of ties is reviewed by R. S. 



of Pearson. Unfortunately, the data pre- 



Ties sented is not complete, but, no doubt, those 



in interested in a study of this subject could 



British India secure the original and complete record 



by correspondence. T. S. W., Jr. 



The Indian Forester, May, 1915, pp. 148-150. 



Mention is made of a tree named ambach, 



Wood belonging to the Mimosa family, covering 



Lighter swamp areas in the region of Lake Chad, 



than Africa. While the specific gravity of dry 



Cork cork varies from 2 to 24, that of ambach 



varies from 1 to 34. At the same time it 



will grow from 12 to 15 feet in height and 8 to 10 inches in 



diameter in one year; the fibre texture is so close that it can be 



cut into planks for tables and doors. If the report of discovery 



is exact, this species should have great commercial value. 



T. S. W., Jr. 

 The Indian Forester, September, 1915, pp. 338-339. 



