1902. 



FORESTRY AND IRRIGATION. 



473 



.stumps as had been cut recently, and 

 in addition the heights of fifty-five trees 

 were recorded. Remains of sixty-seven 

 stumps were found, ranging from one to 

 thirteen inches in diameter, most of them 

 "being between three and ten inches. 



The following table shows the num- 

 ber of trees of each diameter of the 

 three classes dominant, suppressed, 

 and dead : 



A table of heights constructed by the 

 use of a curve is given below. A great 

 deal of variation, however, was found 

 in the heights, seven-inch trees, for ex- 



ample, varj'ing from thirty-three to 

 sixty-two feet in height, according as 

 they are dominant or suppressed : 



From the few analyses of stumps, 

 there seemed to be a variation in age 

 from twenty-five to twenty-nine years, 

 due to a difference in the time of cutting- 

 rather than a diiTerence in the age of the 

 seedlings. The eight stumps measured 

 varied from 7.8 inches to 11. 4 inches in 

 diameter, and had evidentlj' been cut for 

 use at irregular periods without regard 

 for the laws of thinning. The bark av- 

 eraged .7 of an inch in thickness. In- 

 variably the analyses showed the great- 

 est growth in the middle decade of life 

 and a rapid subsequent falling off. 



To calculate more exactly the present 

 value of the stand, the number of posts 



Photo by T. S. Woolsey, Jr. 

 LARCH PLANTATION SHOWING THIN CROWNS AND SLENDER BOLES. 



