CTIOICK (IF ROTATIOX III 



Sugar I'ine, W'estern Yellow Pine, Hemlock and Longleaf as cut for 

 lumber today are generally over 200 years old ; White Pine, Spruce, 

 Lodgepole and Cedar, also Oak, Yellow l-'oplar. Maple and Beech, 

 over 150 years old, and the rest of saw material generally over 100 

 years. 



L'sing 12" d. b. h. as minimum size, measurements thus far 

 made would indicate for ordinary sites a technical Rotation : 



Of forty years and less ( down to twenty-five years) for Cotton- 

 wood, Red Gum, Eucalyptus, Red Wood from sprout, also for 

 Maple, Elm and other timber on good soils like river bottoms, etc. 



( )f 40-60 years for : 



^^'hite Ash, Red C)ak, Chestnut, Elm, liasswood, Cuban and 

 Loblolly Pine, and the following I-'acific Coast trees. Red Fir, Hem- 

 lock, Spruce. Sugar and Western Yellow Pine. 



Of 60-80 years for: 



Norway Pine, Eastern and Western White Pine, Longleaf and 

 Shortleaf ]"'ines of the South, Cypress, Red Fir of the Rockies, 

 Hickory, and Yellow Poplar. 



Of 80- TOO years for: 



White Oaks and Western I'.alsams and Cedars in the mountains. 



( )f I00-T20 years for : 



Maple, lieech, Yellow P)irch of Great Lakes Re.gion and East, 

 Eastern Hemlock. 



Of 120-150 years for: 



Red Spruce, Tamarack, Lodge Pole and Engelman Spruce of 

 the Rockies. 



These figures are mere suggestions, and would be modified 

 within wide limits by the site covered, as well as methods used in 

 care of the forest, planting, thinning, etc. 



e. Furniture lumber and Tight Cooperage call for hardwoods 

 in larger sizes with fully matured heart wood where such decides 

 desirable color and other qualities. PTere 18" d. b. h. may be set as 

 minimum. Tn central Europe, White Oak is grown to an age of 

 160-200 vears and even older. It is doubtful if Rotations of over 

 150 years will he provided for in the future, since combination of 

 good soil and climate and relatively small yield tend to make the 

 raising of this class of timber unprofitable. In addition rapid exten- 

 sion of commerce with the tropics may make it unnecessary to 

 provide for much of this kind of timber in the future. 



