DEVELOPMEXT OF CUBAN PINE. 87 



II. — Growth of Cubiiii Pine during middle and last stages of life, from forty lo one hitiidnd aiulfurty-ftve years. 



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

 good trees are about 20 feet high at ten, 45 feet at twenty, and over SO feet high at fifty years 

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

 mass of wood for any decade is formed 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 maximum: that at one hundred years the average annual growth nearly e<iuals 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. 



Taulk III.— Growth of Cuban Pine. 



] Length 

 Diameter "f'",? i 1 



with bark „„"" Height 



Periduical growth for each decade. 



Feet. Cubic feet, i Cubic feet. 



14. 95 

 29.70 

 47.01 

 59.65 

 72.25 



2.44 

 13.06 

 29.23 



First .... 

 Second... 

 Third.... 

 Konrtb .. 

 Fifth 



Seventll . 

 Eighth . . 

 Ninth ... 

 Tenth ... 



Twelfth . 



Cubic feet.'.Cub. feet. 



