HEIGHT GKOWTH. 29 



Table I. — Ileiijlit (/ruwlh of ll'hile fine pUniitil in luii-n at Ann Jrtior, Miih., hji i/rarx, in inrlien. 



Note. — Trees Nos. 1 to 6 stood in shallow soil on gravel subsoil ; Nos. 7 and 8 in deep loam. 



From this table it appears that these eight trees grew 011 an average hardly more thaa 6 

 inches during the first six years, more than throe times as fast during the next si.x years, and 

 reached a maximum rate of over 27 inches per year during the third jieriod of six years, the 

 decline beginning after the twentieth year and the rate decreasing until it has fallen to about 15 

 inches near the thirtieth year. 



To show how, under less favorable conditions, the i>rogress of self-sown trees is very nearly 

 the same, the following measurements may serve, from which it appears that natural seedlings on 

 pastures, standing more or less crowded, reach at ten years a height of 10 feet; at the age of 

 twenty years about I'S feet, and trees thirty-five to forty years of age, with diameters of 6 to 9 

 inches, attained and even passed the height of GO feet, showing an average growth for that period 

 of 15 to IS inches per year: 



Table II. — Meaaurements of self-sown Jl'hite Pine on paalnre. 

 [Furnished by Mr. J. E. Hobbs, of North Berwick, Me. ; altitude, 250 feet.] 



NOTES TO TAitl-E II. 



No. 1. From old pasture after ono year's tillage ; 5 feet from No. t> ; bore conea. 



No. 2. With Nos. 1 and 3, and from similar trees. 



No. 3. Old pasture, soil shallow, gravelly loam on compact subsoil of saml; pine raised with Hemlock. Oak, and ^^ilpIe, 



No. 4. Level ground, soil heavy loam, somewhat shaded. 



No. 5. From old pasture after one year's tillage; 5 feet from No. 6; bore cones. 



No. 6. From old pasture after one year's tillage; 5 feet from No. 1 : bore cones. 



No. 7. From old jKisture after one year's tillage; 5 feet from No. G; bore cones 



No. 8. From old pasture after one years tillage; 5 feet Irom No. 6; bore cones 



distant from neighbors 8, 34, an<l 19 inches. 

 touched another 4-inch diameter. 



