58 
BULLETIN 1422, U. S. DEPARTMENT OF AGRICULTURE 
Amazon Valley as caucho. The writer had always heard that caucho 
was inferior to Para rubber and had supposed that the generally low 
prices of rubber had nearly forced it out of the market. On the 
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Fig. 12.— A tree of caucho (Castillo, ulei) being felled for tapping 
contrary, he found that it was bought at Manaos and Para for a 
price only slightly lower than that paid for fine hard Para rubber. 
Why this is true is not readily seen. Its inferiority in general is con- 
