DEVELOPMENT OF CUIiAN I'INE. 83 



Tahle II. — Grotvlh of Cuban Vine during middle and lant etaye-i uf li/e, from forty to one hundred and forty-fivi: years. 



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

 j;ood trees are about 20 feet high at ten, 45 feet at tweuty, and over 80 feet high at (ilty years 

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

 mass of wood ibr any decade is found at the early age of fifty, the growth in 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-\imuin; 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. 



Table III. — Grotoih of Cuban Pine. 



Age. 



10... 



20... 

 30... 

 40... 

 50... 

 60... 

 70... 

 80... 

 90... 

 100.. 

 110.. 

 120.. 



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 



Log up to 



5 inches 

 diameter. 



Cubic feet. 



Periodical growth for each decade. 



Decade. 



2.44 

 13.06 

 29. 23 

 45.53 

 58. 35 

 71.17 

 83. 15 

 94. 31 

 105. 48 

 115.27 

 124. 96 



First .... 

 Second . . . 

 Third.-.. 

 Fourth .. 

 Fifth .... 



Sixth 



Seventh . 

 Eighth .. 

 Ninth ... 

 Ti-uth ... 

 Eli'venth 

 Twelfth , 



Area of 



cross 

 section. 



Sq.feet. 

 0.02 

 .10 

 .20 

 .26 

 .31 

 .18 

 .19 

 .21 

 .22 

 !20 

 .20 

 .25 



Volume. 



Cubic feet. 

 0.50 

 3.74 

 10.71 

 14.75 

 17.31 

 12.64 

 12.60 

 11.80 

 10. 98 

 10.94 

 9.61 

 9.60 



^"^f," Current 

 annual l„ ..i„„ 



Oub. feel. : Cub. 

 0.05 I 



.21 



.50 1 



.74 



.94 



.99 

 1.03 I 

 L05 

 1.05 

 1.06 

 1.05 , 

 1.04 



feet. 



0.05 



.37 



1.07 



1.47 



U73 



1.26 



1.26 



1.18 



1.10 



1.09 



.96 



.96 



