6 



WESTERN PINES A3 A SOUECE OF NAVAL STOEES. 



stand on one of the experimental areas. The number of cups per 

 acre varied from 37 in area A to 87 in area C. The trees were divided 

 into two classes, ''yellow pine" and ''black jack," and the dip from 

 each class collected separately. The name ' ' black j ack ' ' is commonly 

 used for young western yellow pine with black, deeply furrowed bark 

 and a comparatively dense crown. Later in life the bark becomes 

 orange and smoother, and the tree is then called ''yellow pine." 

 The period in the tree's life at which the change takes place is varia- 



AREA B ALTITUDE-7400 FT. 

 AREA-8.75 ACRES 

 TOTAL CUPS-SOO 

 CUPS PER ACRE-57 



SECTION 22 



TUSAYAN 



NATIONAL 



FOREST 



areaD altitude-7300 ft. 

 area-2.25 acres 

 100 cups hung on 

 60 selected trees 



AREA* ALTlTUDE-7300 FT. 

 AREA- 13.75 ACRES 

 TOTAL CUPS-SOO 

 CUPS PER ACRE-37 



AREAC ALTITUDE-7S00 FT. 

 AREA-5.75 ACRES 

 TOTAL CUPS-500 

 CUPS PER ACRE- 87 



WAGON ROAD 



BETWEEN 



FLAGSTAFF 



AND 



;RAND CANYON 



t 



COCONINO FOREST 

 EXPERIMENT STATION 



SECTION £8 



COCONINO 



NATIONAL 



FOREST 



Fig. 1. — Location of experimental areas in Arizona. 



ble, and it is fairly common to find black jack of considerably larger 

 diameter than yellow pme gro^\dng close b}'. Table 1 shows the 

 number and size of the tapped trees m each of the three areas, A, 

 B, and C. 



The average size of the trees in area A was greater than that in 

 B or C. In area C the stand was denser and the trees more uniform 

 in size than in the other two areas. Yellow pine predominated in 

 areas A and B, while in C the stand was composed mainly of black 

 jack. 



