ARIZONA EXPEEIMENTS OX WESTERN YELLOW PINE. 9 



The gum was removed from the cups with a wooden paddle and 

 collected in buckets. Each bucketful was weighed to determine 

 the amount of dip collected. 



These details are set forth to show that the experiment was con- 

 ducted with the idea constantly in mind to make the operations 

 similar to those of the Southeast, so that comparable results might 

 be secured. 



YIELDS. 



COMPARISON OF YIELDS OF DIP IN ARIZONA AND FLORIDA. 



Table 3 shows the weight of crude gum or dip secured from the 

 three experimental areas at the various dippings. 



Table 3. — Weight of dip obtained from western yeilow pine in Arizona. 



Area A. 



Area B. 



AreaC. 



Date of dipping. 



Weight 

 of dip. 



Date of dipping. 



Weight 

 of dip. 



Date of dipping. 



Weight 

 of dip. 



1911. 

 Ma.v30 



Pounds. 

 233.75 

 397. 75 

 435. 75 

 388. 75 

 465. 25 

 389. 25 

 335. 75 

 316. 25 



1 



1911. 

 June 1 ... 



Pounds. 

 151.75 

 320.50 

 407.00 

 372.50 

 406.00 

 362. 25 

 299.00 

 205.25 



1911. 



Pounds. 

 171.25 



June 23 



1 June 22 



June 27 



323 50 



July 11 



July 13 



Julvl8 



366.50 



Aug. 1 



\ug. 3 



Aug. 8 



400.75 



Aug. 22 



Aug. 24 



Sept. 16 



Aug. 29 



417.50 



Sept. 12 



Sept. 19 



345. 75 



Oct. 3 . 



Oct. 5 



Oct. 10 



25.5.00 



Oct. 24 



Oct. 26 



Total 



Oct. 31 



151.50 





Total 





Total 



2,862.50 

 .238 



2,524.25 

 .210 



2,431.75 



Average per cup per 



Average per cup per 



Average per cup per 

 week 



.203 











Total weight of dip, all areas, pounds. 7,817.50. 

 Average weight of dip per cup per week, pound, 0.217 

 Each area of 500 cups chipped 24 times. 



There was a total yield of 7,817.5 pounds of gum for the three 

 areas combined (1,500 cups), or an average flow of 0.217 pound per 

 cup per week. Experiments conducted by the Forest Service in 

 Florida show the following yields of crude gum and scrape for the 

 virgin crops: 



Table 4. — Weight of dip and scrape obtained from southern yellow pine in Florida, 1905. 



Crop designation. 



Weight 

 of dip. 



Average 



weight of 



dip per cup 



per week. 



Weight 

 of scrape. 



/^ 



Pounds. 

 63,615.5 

 61,161.5 

 62,587.0 

 1 73,703.5 



Pounds. 



0.256 



.246 



.252 



.297 



Pounds. 

 9,570 





7,650 



Q 



7,245 



D 



8,888 





65,266.9 



.263 



8,338 









Each crop 8,000 cups, chipped 31 times. 

 54464°— Bull. 116—12 2 



