122 



Table I 



Approximate Measurements of the Height Growth of Pinus ponderosa, 

 Made on the Upper Portions of the Main Stem, for Each of the 

 Seasons Indicated, in Inches 



No. 



1909 



1910 



lyii 



1912 



1913 



I 



8 



8 



5 



6 



8 



2 



6 



8 



4 



5 



6 



3 



5 



5 



4 



4 



6 



4 



ID 



10 



6 



10 



ID 



S 



6 



9 



3 



6 



8 



6 



8 



8 



5 



6 



9 



7 



9 



8 



8 



3 



8 



8 



8 



6 



6 



5 



5 



9 



8 



6 



5 



9 



9 



10 



13 



12 



8 



II 



13 



II 



12 



9 



8 



12 



14 



12 



7 



7 



5 



7 



II 



13 



8 



8 



7 



II 



12 



14 



12 



13 



II 



14 



13 



15 



12 



12 



6 



10 



12 



i6 . 



4 



10 



6 



II 



14 



17 



II 



12 



8 



12 



12 



i8 



9 



10 



7 



II 



12 



19 



II 



II 



7 



II 



12 



20 



12 



II 



6 



8 



12 



21 



10 



12 



6 



10 



10 



22 



12 



12 



6 



7 



9 



23 



14 



14 



10 



15 



14 



24 



14 



14 



II 



10 



12 



25 



14 



20 



6 



16 



14 



26 



14 



10, 



12 



14 



14 



27 



14 



10 



10 



14 



13 



28 



13 



II 



5 



12 



13 



29 



14 



15 



10 



13 



14 



30 



12 



13 



10 



XI 



12 



31 



ID 



14 



II 



13 



14 



32 



II 



14 



II 



14 



14 



33 



13 



8 



6 



12 



12 



34 



8 



8 



9 



II 



8 



35 



10 



13 



12 



13 



14 



36 



12 



13 



12 



12 



12 



37 



10 



II 



4 



12 



14 



38 



12 



13 



9 



13 



12 



39 



13 



13 



II 



14 



15 



40 



8 



13 



9 



12 



16 



41 



12 



IS 



7 



13 



16 



42 



8 



8 



6 



10 



12 



Total 



437 



457 



^ 318 



443 



490 



Average 



10.4 



10.88 



7-57 



10.54 



11.66 



records are given for the months April to September inclusive for 

 the years represented by the measurements. The temperature 

 is important in this connection as affecting the rate of transpira- 



