8 4 



THE RUBBER INDUSTRY 



pounds from 3,190 tappings with the machadinho on 



235 trees; and 38*27 pounds from 798 tappings with 

 the gouge on 57 trees. This gives 2i'8 c.c. and 40*1 c.c. 

 per tree respectively for machadinho and gouge. Briefly 

 summed up, the result of the experiment was 



Based on these calculations, the yield per tree with 

 machadinho tapping on 180 days in the year would be 

 4*4 pounds, and for a similar period with the gouge 

 the return would be 8 '6 pounds ; of these totals, the 

 amount of lump and scrap with the machadinho would 

 be 14^ per cent., while w r ith the gouge the quantity 

 would be equal to 37} per cent. 



On the Lower Purus experimental tests carried out 

 from September 27 to October 7, 1913, to ascertain 

 the density of the latex extracted by means of the 

 machadinho and gouge respectively on forest-grown 

 trees, gave the following results : 



