468 



[December, 19i2. 



The amounts of rubber recorded in the tables are their dry weights. 



Experiment 1. 

 System of tapping;— Double V. cuts 18 inches apart. 



Twenty cuts to the inch. Every day tapping. 



Time allowed for bark renewal 2 years. 



No. of trees 1st clearing 80, average girth 26 - 3 inches, elevation 

 300 feet. 



No, of trees 3rd clearing 80, average girth 21*12 inches, elevation 

 1,000 feet. 



Experiment 2. 



System of tapping — Double V, cuts 18 inches apart. 



Twenty cuts to the inch. Alternate day tapping. 

 Time allowed for bark renewal, 4 years. 



No. cf trees 1st clearing 80, average girth 25'6 inches, elevation 

 300 feet. 



No. of trees 3rd clearing 80, average girth 21*4 inches, elevation 

 1,000 feet. 



Experiment 1. Experiment 2. 



1st clearing. 



3rd clearing. 



1st cl 



earing 



3rd clearing 





lbs. 



ozs. 



lbs. 



ozs. 



lbs. 



ozs. 



lbs. 



ozs, 



Total 



. 484 



13 



... 340 



2 



265 



11 



.. 172 



4 



Total Scrap & 



















Bark Shaving. 



.. 70 



14 



... 48 



12 



38 



2 



35 



8 



Total Rubber . 



.. 355 



11 



... 388 



14 



303 



13 



.. 207 



12 









Experiment 3. 











System of tapping— opposite quarters. Two cuts of 18 inches apart 

 on each quarter. 

 Twenty cuts to the inch. Every day tapping. 

 Time allowed for bark renewal 2 years. 



No. of trees 1st clearing 80, average girth 25*1 inches, elevation 

 300 feet. 



No. of trees 3rd clearing 80, average girth 21*6 inches, elevation 

 1,000 feet. 



Experiment 4. 



System of tapping — opposite quarters. Two cuts of 18 inches apart 

 on each quarter. 



Twenty cuts to the inch. Alternate day tapping. 

 Time allowed for bark renewal 4 years. 



No. of trees 1st clearing 80, average girth 25 8 inches, elevation 

 300 feet. 



No. of trees 3rd clearing SO. average girth 21"7 inches, elevation 

 1,000 feet. 



Experiment 3. Experiment 4. 



1st clearing. 3id clearing. 1st clearing. 3rd clearing 

 lbs. ozs, lbs. ozs. lbs. ozs. lbs. ozs. 



Total - 384 10 ... 262 5 ... 187 10 ... 162 8 



Total Scrap & 



Bark Shaving... 57 4 ... 46 10 ... 49 10 ... 32 14 

 Total Rubber ...441 14 ... 308 15 ... 237 4 ... 195 6 



Expt. 1. Expt. 2. Expt. 3. Expt. 4. 

 Elevation Rubber T. Rubber T. Rubber T. Rubber T. Grand Total. 



lbs, ozs. Jbs. ozs, lbs. ozs. lbs. < zs. lbs. ozs. 

 1st Clearing ... 300ft. 555 11 303 13 441 14 237 4 1,538 10 

 3rd Clearing ...1,000 ft. 388 14 207 12 308 15 195 6 ,100 15 



