16 



Eleventh Annual Report 



EXPERIMENT TO DETERMINE THE PERIODICITY OF 



GROWTH. 



The experiment of determining the periodicity of the growth 

 of some of oiir most valuable species of trees, which was began 

 last year, was extended this year to include ten trees each of ten 

 species. The measurement of the growth of the terminal of the 

 tree was taken to the nearest tenth of an inch and the measure- 

 ments were taken at intervals of fifteen days throughout the grow- 

 ing season. In considering this year's results it should be borne 

 in mind that a severe drought set in the first of May and continued 

 until the middle of August. 



The species measured, age and number of trees used in the 

 experiment are as fellows: 



Trees number 1 to 10, yellow poplar, five years old. 

 20, black locust, five years old. 

 25, black walnut, seven years old. 

 30, black walnut, four years old. 

 35, catalpa, five years old. 

 40, catalpa, three years old. 

 50, chestnut oak, seven years old. 

 60, chestnut, seven years old. 

 70, pecan, seven years old. 

 80, coffeenut, five years old. 

 85, ash, seven years old. 

 90, ash, four years old. 



Trees number 11 to 

 Trees number 21 to 

 Trees number 26 to 

 Trees number 31 to 

 Trees number 36 to 

 Trees number 41 to 

 Trees number 51 to 

 Trees number 61 to 

 Trees number 71 to 

 Trees number 81 to 

 Trees number 86 to 



Trees number 91 to 100, elm, four years old. 



The measurements and the date taken are as follows: 



Tree 

 Number. 



May 

 16th. 



M.-iy 

 31st. 



June 

 15th. 



June 



30th. 



July 

 15th. 



July 



30th 



August 

 14th. 



August 

 29th. 



1 



4.4 

 1.7 



.3 

 1. 

 3.9 



.4 

 2.9 

 2. 

 2.7 

 2.5 

 2.4 

 4.2 

 3.5 

 3. 

 3.1 

 2.2 

 2.5 

 1.5 

 2.2 

 1.2 



.4 



.2 

 0. 



.4 



13.5 

 13.8 



4.5 

 15.8 

 16. 



5.5 

 13.9 

 11.2 

 13.7 

 12. 



7.8 

 14.4 

 12. 

 13.5 

 12.2 

 13.5 

 12.4 

 12.6 

 13.2 

 12.5 

 11.4 



6.1 



8.1 

 11.9 



17.6 

 16.2 



9.3 

 23.1 

 21.5 



8.1 

 20.1 

 16.7 

 19.6 

 19.1 

 12.5 

 25.5 

 16.8 

 20.7 

 17. 

 25.4 

 18.4 

 23. 

 18.6 

 16.5 

 16.7 



7.6 

 12.1 

 17.5 



20.3 

 18.6 

 12.6 

 30.2 

 25.8 

 10.7 

 23.4 

 21.2 

 24.3 

 22.6 

 15.8 

 32.7 

 21.9 

 21.6 

 18.2 

 34.9 

 22.9 

 36.3 

 22.6 

 17.3 

 18.8 

 7.6 

 12.8 

 19.4 



21.9 

 22.4 

 17.5 

 36.9 

 31.8 

 11.5 

 25.8 

 25.1 

 30.5 

 25.4 

 26.4 

 42.5 

 26.1 

 23. 

 18.3 

 44.8 

 24.2 

 50.5 

 26.7 

 17.3 

 19.6 

 7.6 

 13.2 

 20.6 



22.2 

 23.6 

 20.2 

 40.8 

 33.7 

 11.7 

 26.2 

 26.8 

 33.9 

 26.3} 

 27.3 

 44.4 

 26.4 

 Br'k'n'off 

 19.1 

 45.2 

 24.1 

 55.2 

 26.7 

 17.3 

 19.6 

 7.6 

 13.2 

 20.6 



22.2 

 23.6 

 20.5 

 40.8 

 35.6 



27. 



36.9 



26.8 



27.3 



44.4 



26.5 



19.2 

 45.5 

 24.1 

 55.3 

 26.7 

 17.8 

 19.6 

 7.6 

 13.3 

 20.6 



22.4 



2 



24.5 



3 



20.9 



4 



41. 



5 



35.6 



6 



11.9 



7 



27. 



8 



27.3 



9 



37.1 



10 



11 



26.8 



12 





13 





14 





15 





16 





17 





18 





19 





20 





21 



22 



19.8 

 7.7 



23 



13.3 



24 



20.6 



