Some Notes on Jack Pine. 



TABLE No. 2. 

 Composition on Site II. 



Diameter 

 Breast high 

 4 in. & under 



Jack 

 Pine 



8.2 



(Average of lo acres) 



Number of Trees Per 

 Balsam, 

 Fir 



9 



10 " 



11 " 



12 in. 



13 " 



i6.5 



27-4 



32.8 



i6.8 



9.6 



3-2 



& under i.6 



•5 



Black 

 Spruce 

 124.4 



41 

 40 

 16 



14 

 12 



44-1 

 2.2 



■ 4 

 ■3 

 .2 

 .2 



9.0 

 30 



Larch 

 .8 

 1-3 

 1.6 

 2.0 

 1-4 

 .6 



• 3 

 .2 

 .1 



^4 ere 



Birch 

 20.8 



3 



8 



4 " 

 I 



Aspen 



.4 



.6 

 1.8 

 1-5 

 1-3 



■ 5 



.2 



.1 



Total 125.4 



Per cent. . . 27 



235-3 

 50.4 



47-4 

 II .2 



8.3 



1.=; 



Trees 10 inches and over in diameter breast high. 



Total 14.9 12.0 .6 



Per cent. ...54.0 43.0 2.0 



40.6 

 8.6 



6.4 

 1-3 



■3 



i.o 



Characteristics of Jack Pixe. 



Form. — Jack Pine on well drained deep soils attains a height 

 of 80 feet, and not uncommonly even 85 feet. In diameter breast 

 high outside the bark 18 inches may be considered a maximum 

 figure (12" — 15" is the average natural size). Isolated speci- 

 mens have been measured 22" d. b. h. and 90' high. Under 

 normal forest conditions the crown is narrow and rather open, 

 covering only the upper portion of the tree. 



Where it grows in the open the branching system is wide and 

 spreading. The limbs pendulous and laden with cones, the whole 

 resembling very closely a typical orchard apple tree. It is short 

 and stunted and would be of use only for fuel when maturity is 

 reached, between 85 and 100 years ; but rot sets in at about 100 

 years, and the tree rapidly deteriorates to a useless condition. 

 Peristency of branches is very characteristic, more so than in 

 other pines. Even under dense crown cover the dead limbs 

 remain on the tree. Knotty lumber results. However, the knots 

 do not seriously affect the use of Jack Pine for ties. 



Under average conditions, the clear height of the stem varies 

 from 30% to 45% of the total length, depending on the age and 

 situation. 



