74^ Forestry Quarterly. 



The forest is to the extent of 71% beech, the least profitable 

 crop, sometimes mixed with ash, maple and oak; the balance is 

 spruce. That the sustained yield is amply provided for appears 

 from the age class distribution, which for beech in loo-year rota- 

 tion runs from the youngest to the oldest 18, 12, 11, 22, 7,7, and for 

 the spruce in 80-year rotation 45, 28, 18, 9. It is intended to 

 increase the spruce area by planting; the cost of planting in 4-foot 

 spacing has varied between $16 and $19 per acre. A regular 

 thinning practice begins in the 30th year. Other silvicultural prac- 

 tice is also described. 



Die fiirstlich Isoiburgischeii Waldimgen bei Birstein. Allegemeine 

 Forst- und Jagdwesen Zeitung. June, 1912. Pp. 181-196. 



UTILIZATION, MARKET AND TECHNOLOGY 



Engineer Petritsch remarks on the very 



Status general interest lately extended to the use 



of of preservatives) of wood, which is not 



Impregnation any more confined to railroads but has 



Practice found its way into all kinds of wood 



consumption ; telegraph and telephone 



poles, posts, mine timber, pavements, even vineyard stakes are 



more or less generally treated. The constant increase in wood 



consumption together with the rise in prices explains this. 



A table brings the results of mycological investigations into 

 quantities of impregnation fluids in percent which must be used 

 in order to prevent the growth of fungi on gelatine — which are 

 an indication (and only such) of the amounts needed in practical 

 treatment and their relative poison value. 



After Malenkovic After other 

 authorities 

 Per cent. 



Copper sulfate (Cu S O4) 4 —4.5 3 —3-5 



Zinc chloride (Zn CI2) 3.5 3.5—4-5 



Chloride of Mercury (Hg 



Chloride of Mercury (Hg CI2) .15 — .25 



Creosote oil without acids 5 — 10 . 15 



" with 10% acids 2 — 4 .15 



