DEVELOPMENT OF CUBAN PINE. 83 



Taisle II. —Growth of Cuban I'iue during middle and last stages of life, fromfortij to one hundred and forty-five ijeurs. 



From Table III the rapid growth of this species is (iiiite apparent. It will be observed that 

 good trees are about -'0 feet high at ten, 45 feet at twenty, and over 80 feet high at fifty years 

 of age, when the rapid rate of upward growth comes to a stop. It appears, also, that the greatest 

 mass of wood lor any decade is found at the early age of fifty, the growth iu volume being nearly 

 15 cubic feet for these ten years, and that at ninety the growth in volume is only about two-thirds 

 of the ma.ximuin; that at one hundred years the average annual growth nearly equals the current 

 growth, thus indicating that the age of proper exploitation has been reached, i. e., that now the 

 tree is ripe for the ax, as far as profitable growth, represented in volume accretion, is concerned. 



Tahle III. — Growth of Cuban Pine. 



Age. 



10.. 



20.. 

 30.. 

 40.. 

 50.. 

 60.. 

 70.. 

 80.. 

 90.. 

 100. 

 110. 

 120. 



Length 

 Diameter! °£ui? 



inches. 



Inches. 



2.9 



5.9 



9.3 



12.3 



14.8 



16.0 



17.6 



18.8 



20.0 



21.4 



22.4 



23.4 



5 

 24 

 40 

 50 

 60 

 69 

 76 

 83 

 90 

 96 

 100 



Height 

 of tree. 



Feet. 

 20 

 45 

 66 

 75 

 83 

 89 

 93 

 96 

 99 

 101 

 103 

 105 



Volume. 



Tree. 



Cubic feet. 

 0.50 

 4.24 

 14.95 

 29.70 

 47.01 

 59.65 

 72.25 

 84.05 

 95.03 

 105. 97 

 115.58 

 125. 18 



Periodical growth for each decade. 



Log up to 

 5 inches 

 diameter. 



Cubic feet. 



2.44 

 13.06 

 29.23 

 45.53 

 58. 35 

 71.17 

 fi3. 15 

 94.31 

 105. 48 

 115.27 

 124. 96 



Decade. 



First .... 

 Second . . . 

 Third... 

 Fourth . . 

 Fifth .... 



Sixth 



Seventh . 

 Eighth . . 

 Ninth ... 

 Tenth ... 

 Eleventh 

 Twelfth . 



Diam- 

 eter. 



Inches. 

 2.1 

 2.6 

 3.0 

 2.6 

 2.5 

 1.2 

 1.2 

 1.2 

 1.2 

 1.0 

 1.0 

 1.0 



Height. 



Feet. 



20 



25 



21 



9 



8 



6 



4 



3 



3 



2 



Area of 



cross 

 section. 



Sq.feet. 

 0.02 

 .10 

 .20 

 .26 

 .31 

 .18 

 .19 

 .21 

 .22 

 .20 

 .20 

 .25 



Volume. 



Average 



annual 



accretion. 



Current 

 accretion. 



Cub. 



fen. 



0.05 



.37 



1.07 



1.47 



1.73 



1.26 



1.20 



1.18 



l.IO 



1.09 



.96 



.96 



