Canadian Forestry Magazine, November, ip20 



549 



Fresh Beef for Camps 



This is a product your men will want on the table. Feed them 

 with the best. Buy Davies' product. We can also supply you 

 with frozen Beef. All we ask is a trial order. Write, or wire 

 to-day at our expense, and we will gladly submit delivered prices. 



Also Try, 



Long Clear 

 Bacon 



Peerless 

 Shortening 



Davies 

 Mincemeat 



Mess 

 Pork 



1 



THE 

 WILLIAM 



MONTREAL. 



DAVIES 



COMPANY 

 LIMITED. 



TORONTO. 



HAMILTON. 



How Forest Disease Cuts Our Wood 



Crop by Half 



By James Kay, B.Sc, F. 



While a member of a party cruising a 

 tract of virgin timber in Southern Brit- 

 ish Columbia and Western Montana this 

 summer, T was struck by the large 

 amount of damage done to trees by 

 wood rotting fungi. 



I'orest fires are spectacular, and com- 

 batting them is a source of worry and ex- 

 pense, and the damage and luss is self- 

 evidenl, whereas the loss caused in the 

 forest by fungi may often escape notice 

 owing to the insidious natiu'c of its at- 

 tack, the loss may only be evident after 

 telling, or after the trees have been s.awn 

 at the mill. 



Forest trees are subject to nierlianieal 

 injuries — snow-break, trees falling and 

 hreaking branches and scraping bark otT 

 the trunks, bears and deer also damage 

 the stems by tearing and scraping tlie 

 bark. Tt is at these injured jioints that 

 the spores of fungi find lodgement and 



if ample moisture is present thev will 

 germinate and will develop a white fib- 

 rous or matted body called the mycelium, 

 which grows and spreads in ail direc- 

 tions in the wood. The wood rotting 

 fungi, however, e.xcrcte certain ferments 

 which extract the lignin from the cell 

 walls ; also in most cases thev are able 

 to (Hssolve completely the basic stnic- 

 luiT of the cell wall by other ferments. 



The number of fungi which alTect the 

 lumberman, most closely, are the bracket 

 fungi, and arc broadly represeiUed bv the 

 perennial form "Ft^ices" and the an- 

 nual form "Polyporus." The species 

 h'onces form hard woody shelf-like 

 structures, and as long as the mycelium 

 can obtain food material in its advance 

 into the wood it will develop a new layer 

 ot tubes on the under surface each vear. 

 Thus, the size of the fruiting body in- 

 creases vearlv. 



