30 PROTECTION OF PLANTS, 1921-22 



This is the yield in board feet of a log 10 inches in diameter and 10 feet long 

 according to the Doyle rule used for scaling logs in Ontario. He also estimates 

 the annual cut of pine to be about one third greater than the annual growth. 

 In fact the Government of Ontario paid back into the treasury- §900,000 from 

 the revenues derived from the forests on the assumption that at least that 

 value of material had been taken from the forest capital stock and did not 

 therefore in reality represent current revenue. The published reports indicate 

 that certain pulpwood companies in Quebec have been doing a similar thing 

 for the past few years, a transaction that can be interpreted as an acknowledge- 

 ment that they are cutting their forests faster than J^iey are growing. It 

 will be seen, then, that such data as we have on the rate of growth in our 

 forests indicate that the annual toll taken by the logging operations, by fire, 

 disease and wind far exceeds the annual accretion of wood by the natural 

 processes of growth. 



Briefl}', our forest conditions present this problem: Shall we accept for 

 our lumbering and pulpwood industries the wood of constantly decreasing 

 qualit}' which nature unguided produces when the equilibrium in the forest 

 has been upset bj' fire, disease or logging operations, or shall we exert intelligen 

 effort to maintain our pine, spruce and other valuable forests and thus supply 

 the forest industries with wood of incomparable quality particularly adaptedt 

 to their needs ? 



It is both a challenge to human intelligence, a necessity from a business 

 standpoint, and the part of patriotism to keep the natural forest areas contin- 

 uously' productive in terms of commercially valuable trees — trees whose 

 products annually increase the wealth of the country by nearly a half billion 

 dollars. 



GNATS— BLACK FLIES— SIMULIA 



By Dr. J. C. Chapais, St. Denis-en-bas, P. Q. 



Last year (1921), about the month of June, one of my Canadian friends, 

 living now in the United States, wrote to me the following letter: 



Plattsbukg, N.Y., June 11th, 1921. 

 Dr J.-C. CHAPAIS, 



Saint-Denis, P.Q. 

 Dear Sir, — 



The various translations T have made while I was living at the I. A. 0. 

 have made me familiar with the names of manv noxious and useful insects. How- 



