Periodical Literature. 487 



species of wood as affected among other things by the products 

 obtained, the amount of heat needed, the moisture content of the 

 wood, the relative vahie of different parts of the tree, and re- 

 covery of products from escaping gases. 



Hardwood Record, April. 1914. 



The results of four experiments carried 

 Douglas out on a commercial scale to determine the 



Fir value of distillates from Douglas fir 



Distillation. stumps, along with other supplementary 



investigations, show that distillation as an 

 aid for clearing land is entirely out of the question, according 

 to G. M. Hunt of the Forest Service. The processes employed 

 were steam distillation with and without subsequent extraction, 

 destructive distillation, and combined steam and destructive dis- 

 tillation. The experiments are described in detail in a 3,000 

 word article, and the summary brings out a comparison of the 

 yields of Douglas fir to those of Norway pine and Longleaf 

 pine, although not an exact comparison. 



Turpentine Other Oils Tar Rosin 



Douglas fir 1-4 gal. 3- 8 gal. 15 gal. 75-150 tbs. 



Norway pine 8-18 " 10-20 " 300 " 



Longleaf pine 10-20 " 7-16 " 25-45 " 



The yield of charcoal is about the same for each. While the 

 yields of acid and alcohol cannot be compared, those from Doug- 

 las fir are so low that it is doubtful if they could be profitably 

 saved. 



Besides' the small amount of product, other things stand in the 

 way of profit. The products are different from those of Norway 

 and Longleaf, and are not favored on the market. The large 

 stumps make expensive handling, and, besides, the mill-waste is 

 more easily handled and is much more than sufficient to supply 

 the Pacific Coast demands, even if the market would take kindly 

 to the products and all of the eastern materials were driven out 

 of competition. 



Timberman, April, 1914. 



