642 Forestry Quarterly. 



if in a rotation of 20 years the product is 34 cubic feet in a 30- 

 year rotation it will be, say 60, and in a 40-year rotation, 65 cubic 

 feet per year ; and the shaft length will also be improved. 



To attain such remarkable production (in the balmy climate 

 and first-class soil of France. Ed.), i. e. the maximum of work- 

 wood in shortest time and with the least working capital, the 

 following rules should be followed : 



1. Avoid leaving too many trees for overwood in the younger 

 age classes. 



2. Leave the largest number in the oldest age class, the elite or 

 batallion sacre. 



3. Avoid the leaving of the less valuable and shady beech, 

 which smothers underwood and oak. 



4. In the underwood favor the rapid growers, elm, ash, birch, 

 which furnish good enough fuelwood and do not impede the oak. 



Mathey himself agrees that this form (as a permanency!) be- 

 longs to the fertile soils and can by no means be substituted for 

 the timber forest everywhere. 



The average results which are being attained in these, as yet 

 imperfect, forests near Dijon are stated as $2.50 to $5.00 per 

 acre, which the author thinks can be doubled. 



Schweizerische-Zeitschrift fiir Forstwescn. September and October, 

 1911. Bulletin Societe forestiere de Franche-Comte et Belfort, 1909. 



UTILIZATION, MARKET AND TECHNOLOGY. 



Laris very briefly discusses critically the 

 Raping Riiping process of impregnation, introduced 



Process in 1903, which has in view the cheapening 



of of treatment with tar oils. 



Impregnation. After pointing out that of the many anti- 



septics proposed, only zink chloride, carbolic 

 tar oils and chloride of mercury remain practicable and that zink 

 chloride by itself is unsuitable because readily washed out and 

 being injurious by its free acid to the rails, while tar oil impreg- 

 nation is expensive (60 cents per tie) and the combination of tar 

 oil with zink chloride costs only 15 cents — he formulates the re- 

 quirements of a faultless method of impregnation as follows : 

 I. The liquor used, besides its antiseptic qualities, must have the 



