CANADIAN VOLUME TABLES. 



By E1.1.WOOD Wilson, 



Forestry Division, Laurentide Paper Company. 



The measurements on which the following volume tables were 

 based were made thruout the Valley of the St. Maurice River in 

 the Province of Quebec between latitude 46° 30' and 48°, and 

 west longitude 74° 30' and 76°, during the winter of 1910-11. 



The sawyers were followed and as soon as a tree was felled 

 and sawed up into logs it was measured as follows : — ^height of 

 stump, diameter inside and outside the bark on the stump, at each 

 thirteen and one-half feet cut, and total length of top. Diameters 

 were measured to nearest millimeter, heights of stumps to nearest 

 centimeter and lengths of tops to nearest decimeter. Metric 

 measures were used as being easier to make and as facilitating 

 calculations. Diameter breast high, outside bark was also 

 measured and the trees arranged in inch classes according to 

 breast height diameter, f inch to f inch representing whole inch 

 class, i. e. trees having diameters between 6f and 7f inches were 

 put into the seven inch class. 



For the board feet tables, the number of board feet corres- 

 ponding to the diameter inside the bark at the small end of each 

 log was taken from the official Quebec table and volumes of logs 

 added to get volume of tree. 



The volume in cubic metres was calculated for each tree by the 

 following formula : 



vol.=l(a+2b+2c+d)i 

 in which a=basal area on stump, b^basal area at first cut, c= 

 basal area at second cut, and d=basal area at third cut, and 1^ 

 length of log. 



To facilitate calculations, which were all done by machine, a 

 table was prepared giving the basal area corresponding to each 

 millimeter in diameter, multiplied by half the log length. Cubic 

 metres corresponding to the diameters could thus be taken direct 

 from the field sheets and added on the machine. 



All the values for each inch class were then added together 



