APPENDIX. 69 



ton. The diagram, etc., here given, was printed in the Report of 

 the Division of Forestry for 1887. 



That the cutting of sapling pine growth to which we have alluded 

 is an unwise and improvident policy, is clearly shown in the history 

 of this tree. To illustrate : 



Let the number of inches on radius represent as many sei'ies of 

 years, and, let the rings in each series represent hollow cones one 

 inch thick, the length of the tree at any given age, one inside another, 

 like a nest of measures. 



The superficial contents of these cones, can be approximately 

 determined by multiplying one-half the circumference of the base, 

 in inches, and dividing by twelve, the result will be the measure 

 in feet b. m. of the increment of wood for that series of years. 

 This divided by the number of rings in that series will show the 

 yearly growth. 



For example : Our outside cone will be 107 feet long, the length 

 of the tree ; this multiplied by thirty-four and one-half inches, — 

 half the circumference of the fii'st section — which is twenty-three 

 inches in diampter, and divided by twelve gives 307 feet board 

 measure, this divided by fifteen, the number of rings gives twenty 

 and one-half feet, b. m., as the average annual growth for that 

 series. 



To be more exact in the measurement, the average annual growth is 

 twenty-one and one-half feet, for this series. If this tree had been 

 cut when it was fifty-eight years old and sixty and four-twelfths 

 feet high, then our outside cone would have numbered tight rings 

 — the diameter of the first section was then thirteen ii ches and the 

 amount of wood added fifty-four feet or six and three-fourths feet 

 per annum. Thus it appears that this tree added to its bulk, three 

 times more wood in its 122d year than it did in its fifty-eighth year. 



If a tree one foot in diameter is twenty-four years old, each ring 

 is oue-fourth inch in thickness. If it adds a ring of the same thick- 

 ness each year it will contain eight times as much material at forty- 

 eight years of age and twenty-seven times as much at seventy-two 

 years as at twenty-four. If. however, it adds an annual ring of 

 only on -eighth iuch in second twenty-four years, and one-sixteenth 

 inch in the third twenty-four, then at forty-eight years, it will con- 

 tain, approximately, thrrC and one-half times, and at seventy-two 

 years five and one-half times as much material as at twenty-four 

 years. Under average conditions it will piobably do better than that. 



