. Canadian forestry journal. Forests and forestry -- Canada Periodicals. Canadian Forestry Magazine, Xorcniber^ ip20 ;i7. An oblique photograph taken from a seaplane of a section of the north shore of Lake Nipissing, Ontario. The eye can easily detect how the white birch preponderates and where the patches of coniferous trees are located. Experts could easily ascertain from this photograph the approximate stand of merchantable timber on such an area. within two years after the trees are de- foliated. In addition to the aerial obser- vations, a thorouo^h investigation of the infestation is bein
. Canadian forestry journal. Forests and forestry -- Canada Periodicals. Canadian Forestry Magazine, Xorcniber^ ip20 ;i7. An oblique photograph taken from a seaplane of a section of the north shore of Lake Nipissing, Ontario. The eye can easily detect how the white birch preponderates and where the patches of coniferous trees are located. Experts could easily ascertain from this photograph the approximate stand of merchantable timber on such an area. within two years after the trees are de- foliated. In addition to the aerial obser- vations, a thorouo^h investigation of the infestation is being conducted on the â ground in the areas shown to be attacked. Fortunately, the damage in Ontario is as yet comparatively light and is confined to scatteied spots between Redwater on "the T. & railway and the height of land and it has not spread very far east of the railway. It is expected that next year the insects will spread from these s])ots unless prevented by weather or â other natural conditi()n>. Jl'hat a /'V/.-/;/ Piscloscs. In connection with the survex' of the forest resources of Ontario which is be- ing conducted by the Commission oi Conservation the opporlunit\- of study- ing the forest Cl^^dilinnâ ^ I'ruin llie air was of the greatest value. I'rmn an alti- tude of feet, it was jiossiblc in map in with a reasonable degree of accuracy the main forest types such as recent l)urns, muskeg, softwood, hardwooil and mixed forests. It is possible to distin- guish even some of the more conspicu- ous species of trees and with a very limited amount of ground work in the various types, a comprehensive know- ledge of the forest conditions over large areas was secured in a short time. In spite of the fact that on more than half the (lavs adverse weather conditions made aerial observation impossible, the fores- ter > u ere able to map in the broad forest types on sq. miles in the three weeks thev were operating around lake Tinu's- kaiuing. It is
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