PERIODICAL LITERATURE 8|-:^ 



The author lays stress on the fact that Norr 

 A Rational way will always receive much revenue from her 



Forest forests, that the safest way of safeguarding the 



Utilization forests is by education of the people, by accumu- 



lation of fundamental knowledge, and until this 

 is assured there must be Governmental regulation and supervision. 

 The office of Herred-Forrester has been instituted to meet this need, 

 to see that the laws are enforced, that no one but those who know best 

 prescribe the cuttings, that capable men are put in charge, and that the 

 right kind of information is gathered. About one-half of the country 

 has now accepted this measure. J. A. L. 



Opland, Evenby J. Herredsskogmesterinstitutionen og dens betydning for et 

 rationalt skoghruk. Tidsskrift for Skogbruk, 28 :210-218, 1920. 



The tensile strength of wood may be 20 times 

 Ordinary J Food as great parallel to the grain as perpendicular to 

 Compared zuith the grain, and its modulus of elasticity from 15 

 ■ Plyivood to 20 times as high. The shearing strength per- 



pendicular to the grain is much greater than par- 

 allel to the grain. The shrinkage from green to oven dry condition 

 across the grain of a flat sawed board is about 8 per cent, for a quar- 

 ter 'sawed board 4^/2 per cent, and parallel to the grain practically 

 negligible. The purpose of plywood is to meet these deficiencies by 

 cross-banding so that the properties of the built-up wood are approxi- 

 mately equal in two directions, both parallel and perpendicular to the 

 grain. J. K., Jr. 



U. S. Forest Products Laboratory. Madison, Wis. Lumber, 871 : 49, 1912. 



The planting of eucalyptus in southern Cali- 



Bucalypfns fornia was boomed in IIJO^ to 1910. There are 



Lumber said to be something like ;500 species of the genus 



Not Yet now growing in that region. It grows rapidly, 



Established especially during the- first three or four years, and 



on the average reaches a usable size in 1-5 to 30 



years. One of the chief difficulties in making use of the lumber is its 



unusual inclination to curl and warp, and the exceptional difficulty of 



curing it satisfactorily. Its most general use is for firewood, but it is 



also being employed. in the manufacture of farm implements, wagon 



