REvncws 421 



eration survey, which is being carried on in that province under a plan 

 of co-operation between the Commission of Conservation and the 

 Laurentide and Riordon Pulp and Paper Companies. In addition to 

 studies of regeneration, volume and growth of pulpwood species, per- 

 manent sample plots have been established upon which detailed observa- 

 tions will be taken periodically throughout a long period of time. 

 Collaboration is also established with the Dominion Entomological 

 Branch, under which Dr. J. M. Swaine is making investigations of 

 forest insects, with special reference to the balsam (or spruce) bud- 

 worm, which has caused enormous damage in the pulpwood forests of 

 eastern Canada, the damage to the balsam being much greater than to 

 the spruce. 



Dr. Howe contributes also a second paper entitled "How Shall We 

 Make Our Forests Safe for Trees ?" In this are discussed losses from 

 fire, insects, and disease, and the effect of present methods of conduct- 

 ing logging operations, in the gradual or rapid conversion of the mixed 

 softwood-hardwood forests into hardwood forests. 



Mr. Craig's contribution to the report comprises a review of air 

 plane lumber production in British Columbia. During the latter por- 

 tion of the war Mr. Craig's services were loaned by the Commission 

 of Conservation to the Imperial Ministry of Munitions in order that he 

 might take charge of the inspection of air plane lumber purchased in 

 British Columbia for the British Government, through the Imperial 

 Munitions Board. Major Austin C. Taylor was appointed Director 

 of the Department of Aeronautical Supplies by the board, his assistant 

 being H. R. MacMillan, formerly Chief Forester of the British Colum- 

 bia Forest Branch, but who, more recently, has gone into the export 

 timber business, with headquarters at Vancouver. Mr. Craig's report 

 summarizes the important contribution made by the forests of British 

 Columbia toward the winning of the war. through the furnishing of 

 large quantities of Sitka spruce and Douglas fir for air plane manu- 

 facture. C. L. 



Effect of Kiln Drying on the Strength of Airplane Woods. By 

 T. R. C. Wilson, Forest Products Laboratory. Report No. 68 of the 

 Fifth Annual Report of the National Advisory Committee for Aero- 

 nautics, 1920. 



In this report are given the summaries and conclusions obtained 

 from over 100,000 mechanical tests, covering approximately 100 kiln 



