TSUGA 267 



summer wood, the lenticular orifice becoming oblong, 2-4, or in the 

 summer wood 1-2, per tracheid. Bordered pits round or elliptical in 

 1-2 rows, more rarely in i row only, the orifice large. Pits on tin- 

 tangential walls of the summer wood rather numerous, prominent, 

 flat. Resin cells 15 p. wide, 165-240 p. long. 



Tangential. Rays numerous, low to high, not very broad, usually con- 

 stricted at the position of the frequent narrow and oblong tracheids ; 

 the parenchyma cells rather equal and chiefly narrowly oval to 

 oblong, sometimes broadly oval. 



A tree 21-33 m - high an d with a trunk .90-1.15 m. in diameter. 



Wood light, soft, not strong, brittle, coarse, crooked grained, difficult to 



work, liable to wind shake and splinter, not durable (Sargent). 

 This wood is of great value for construction purposes, where it is to be 



constantly submerged in water, when it possesses elements of great 



durability (Bovey). 



Relative specific gravity 0.4239 



Percentage of ash residue 0.46 



Approximate relative fuel value 42.20 



Coefficient of elasticity in kilograms on millimeters . . 900. 



Ultimate transverse strength in kilograms 307. 



Ultimate resistance to longitudinal crushing in kilograms 6142. 



Resistance to indentation to 1.27 mm. in kilograms . . 1314. 

 (Sargent) 



According to the results obtained by Dr. Bovey in the testing laboratories 

 of McGill University, the following data may be given: 



Coefficient of strength in pounds per square inch for : 



Bending 5000 



Torsion 8000 



Compression 3200 



Shear 380 



Weight of i cubic foot 33 



Abundant on cold soils, Nova Scotia and New Brunswick, and throughout 

 Quebec and Ontario ; northward from Quebec to the northern end of 

 Lake Temiscaming, thence to the eastern extremity of Lake Superior at 

 Agawa (Macoun) ; through the northern United States to Newcastle 

 County, Delaware, and along the Allegheny Mountains to Clear Creek 

 Falls, Winston County, Alabama ; southeastern Michigan and central 

 Wisconsin (Sargent). 



2. T. Sieboldii, Carr. 



Jap. = Tsuga 



Transverse. Growth rings narrow, uniform, the prominent summer wood 

 dense, about one fourth to one half the spring wood, from which the 

 transition is gradual. Spring tracheids squarish-hexagonal, rather 



