HEIGHT GROWTH. 



29 



Tabi.k I. — Height yrowlh of ll'hile I'iiiv iilaiilcd iii lawn at Ami Jrhor, .Mich., hij years, in inches. 



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



From this table it appears that these eight trees grew on an averajie liardly more tlian (> 

 inches during the first six years, more than three times as fast during the next six years, and 

 reached a inaxiinuiu rate of over 27 inches per year during the third period 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 progress 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 -'5 feet, and trees thirty -five to forty years of age, witli diameters of G to 9 

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

 of 15 to 18 inches per year: 



Taiii.k TI. — Measurements of svlf-Hoicn IVIiilil'iue on pasture. 

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



NOTES TO TAlU.Ii 11. 



No.l. From old paaturo after one year's tillage; 5 feet from No. 0; bore cones. 



No. 2. With Is'os. 1 ami 3, aiul from Himilar Iree.-^. 



No. 3. OM pasture, aoil slialh»w. {gravelly loam on compact subsoil of saini ; pine mixed with IlenilneU. OaK. and Maple. 



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



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



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



No. 7. From old i)astvire after one year's tillage; 5 feet from No. 0; boro cones; distant from neighbor.-* H. 34, and 19 inches. 



No. 8. From old pasture after one year's tillage; 5 feet from No. 6; bore cones; touched another 4-iuch diameter. 



