76 



Eleventh Annual Report 



Even taking into consideration all of the factors involved, the 

 fact remains that individual peculiarities of growth, in the limited 

 number of specimens examined under each species, may in some 

 cases have modified the results to such an extent that the figures 

 given do not express the true average annual growth rate. This 

 variance in growth rate in different individuals of the same species 

 under practically identical conditions is shown in Table II, modified 

 from that prepared by Messrs. Taylor and Brodie. 



TABLE n. 



Shortest Time in Which Individual Trees Reached a Diameter of Six Inches and of 



Twelve Inches. 



Species. 



Six Inch 

 Diameter 



Shortest 

 Time. 



Six Inch 



Diameter 



Average From 



Table I. 



Twelve Inch 



Diameter 



Shortest 



Time. 



Twelve Inch 



Diameter 



Average From 



Table I. 



Birch 



Years. 

 38 

 18 

 60 

 28 

 75 

 80 

 22 

 40 

 18 

 54 

 20 

 16 

 45 

 28 

 31 

 34 

 19 



Years. 

 48 

 29 

 75 

 44 

 95 

 100 

 32 

 48 

 28 

 74 

 25 

 60 

 60 

 42 

 41 

 44 

 27 



Years. 

 70 

 38 

 90 

 58 

 130 

 150 

 40 

 62 

 40 

 120 

 40 

 30 

 70 

 55 

 50 

 50 

 32 



Years. 

 100 



Chestnut... . 



60 



Beech 



150 



White ash 



110 



Black hickory 



150 



Shellbark hickory 



210 





70 





100 



Yellow poplar 



60 



Black or sour gum 



150 



Scrub or Jersey pine 



80 

 94 



White oak 



120 



Scarlet oak 



80 



Chestnut oak 



80 



Black oak 



73 



White elm 



56 



These variations in growth rate show conclusively that the 

 figures given are relative and not absolute and that they will prob- 

 ably require modification upon the examination of a larger num- 

 ber of specimens. There is also the suggestion to be drawn from 

 this table that in the reinforcement of existing woodlots or in the 

 reforestation of denuded areas only seed coming from rapidly 

 growing trees should be utilized. This is especially important in 

 the work of reinforcing existing wooded areas if satisfactory finan- 

 cial returns are secured. The solution of the problem of the timber 

 supply in Indiana lies largely in the hands of woodlot o^vners. 

 If the woodlots are made to carry their full load of such species 

 as will come to marketable size within a reasonable time, the prob- 

 lem is practically solved. From tables one and two data can be 

 secured which will make it possible to undertake this reinforcement 

 in an intelligent way and with every assurance of success. 



