AEIZOXA EXPERIMENTS OX WESTEEX YELLOW PIXE. 



Of the 388 yellow piiies tapped, 89 had some defect, such as a 

 fire-scarred butt, dead top, or large number of dead Imibs. Of the 

 395 black jacks, only 15 were defective. The greatest proportion of 

 defective trees was in area A among the large yellow pines. 



Table 1.— Number and size of tapped trees in the Arizona expervmmts; areas A, B, and C. 





Number of trees. 



Diameter, breast 

 liigli. 



Area A. 



AreaB. 







Area C. 







Black 

 jack. 



Yellow 

 pine. 



Total. 



Black 

 jack. 



Yellow 

 piBe, 



Total. 



Black 

 jack. 



Yellow 

 pine. 



Total. 



Inches. 

 12 



Number. 

 4 

 3 



11 

 8 

 6 

 6 

 13 

 12 

 16 

 4 

 9 

 2 



1 



1 



Number. 



1 



Nu mber. 

 5 

 3 



12 

 10 

 9 

 11 

 16 

 18 

 23 

 15 

 16 

 8 

 8 

 7 



16 



3 



8 



12 



8 



■ 7 



5 



4 



3 



3 



4 



3 



1 



1 



1 2 



Number. Number. 

 7 ?t 



Number. 

 10 

 10 

 26 

 15 

 18 

 21 

 13 

 15 

 22 

 20 

 19 

 14 

 14 

 13 

 9 

 5 

 5 



I 



3 



Number. 



13 



25 



28 



34 



23 



17 



18 



17 



11 



3 



3 



2 



4 



3 



Number. 

 2 

 2 

 4 



7 

 5 

 8 

 3 

 4 

 7 

 2 

 3 

 5 

 8 

 4 

 5 

 2 



Number. 

 15 

 27 

 32 

 41 



13 . . . 



8 

 19 

 11 

 10 

 13 

 7 

 6 

 4 

 3 



I 



2 



7 

 4 

 8 

 8 



t 



18 

 17 

 18 

 12 

 14 

 12 

 9 

 5 

 4 



t 



3 

 3 



14 



1 

 2 

 3 

 5 

 3 

 6 

 7 



11 

 7 

 6 

 7 

 6 



15 

 3 

 7 



11 

 6 

 7 

 5 

 4 

 3 

 3 

 4 

 3 

 1 

 i 



12 



15 



16 



17 



25 

 21 

 21 

 18 

 5 

 6 



18 



19 



20 



21 



22 



23 



24 



l'^ 



25 .. 



1 



7 



26 



5 



27 







2 



28 



1 

 1 

 2 



1 









29 







1 



1 



30 





1 



31 







2 



32 











33 









1 



1 



34 















35 













i 





36 







1 



1 







37 











1 



1 



38 















39 









1 1 































Total 



101 



140 



241 



93 



171 



264 



201 



77 



278 







1 One of these 45 inches in diameter. 

 Tapped trees on areas A, B, and C: Black jack, 395; yellow pine, 388; total, 783. 



WEATHER CONDITIONS. 



Table 2 shows the weather conditions throughout the Arizona 

 experiments: 



Table 2. — Meteorological record, Fort Valley (Ariz.) experiment station, 1911. 





Temperature. 



Precipitation. 



Relative humidity. 



Month. 



Mean. ^ 



Mini- 

 mum. 



Rain. 



Snow. 



Mean. 



Maxi- Mini- 

 mum, mum. 



i 



April 



39.9 

 47.9 

 56.4 

 60.7 

 61.4 

 56.8 

 44.7 

 35.9 



° F. 

 65.0 

 72.2 

 83.1 

 83.8 

 84.9 

 79.2 

 70.3 

 51.0 



° F. 

 17.9 

 21.9 

 26.3 

 80.4 

 41.2 

 84.5 

 12.6 

 20.5 



Inches. 



0.22 



Trace. 



.22 



5.71 



2.76 



3.47 



2.68 



.22 



Inches. 

 Trace. 



trace. 



Per cent. 

 51 

 46 

 40 

 69 

 59 

 61 

 54 



Percent. Percent. 

 90 1 20 



May 



70 

 74 

 97 

 92 

 100 

 100 



21 





16 



July 



26 





25 





20 





17 



Nov 1 15 











