Arg. or to their near families. It is higher and more vigorous 
than the trees in the inundated districts and has somewhat larger 
and longer seeds. Trees of more than 40 meters in height and 
up to five meters in circumference, are not rare. Whether the 
Acre fine rubber tree is a special species or a variety of Hevea 
Braziliensis, can be determined only by a very painstaking in- 
vestigation. In yield of rubber and quality of product, the Acre 
tree surpasses that of the inundated districts. 
Of other Hevea varieties Hevea cuneata Hub. the Seringa 
vermelha, occurs but rarely, also sapium tapuru, Ule, is found 
but rarely. Castilloa Ulei, Warb., the “caucho” of the Peru- 
vians, is quite plentiful and is generally utilized, its exploitation 
being regarded sometimes as more profitable than the fine rub- 
ber. Just as in the Amazon country, under the title “caout- 
chouc,” the product of castilloa is mainly understood, so, in 
Acre, for the yield of the Hevea, the name “fine rubber” is used. 
At present, there are on the Acre no unowned, unused lands, 
but some of the seringaes in operation are capable of further 
development. In lower Acre there are many seringaes that are 
badly exhausted and furnish but a small yield. The rubber col- 
lectors too, who, as is well-known, cut down the Castilloa trees, 
are compelled to go further into upper Acre all the time to find 
profitable work. 
Acre territory is regarded as the most productive fine rubber 
section, especially on its borders; on the little river Hapury and 
towards the Taurumano, which belongs to the water-shed of the 
Madeira, the output is said to be exceedingly rich. In propor- 
tion to their longitudinal extent, the extent of the woods belong- 
ing to Acre, in breadth, is comparatively small, for in a one or 
two days’ journey, it is possible to reach the district of another 
river. The rubber forest properties are consequently all meas- 
ured from the river and include usually, a territory of several 
hundred square kilometers, often in fact, equal to small princi- 
palities. Many owners have also several seringaes, often in 
Bolivia and Brazil simultaneously. 
In such a seringal on the river bank, the dwelling with ware- 
house accommodations and sales-place, is erected, known as the 
Baracao in contradistinction to the small Baraken of the work 
people. 
About the Baracao the forest is usually cleared to afford land 
for planting and pasture for the cattle. 
The management of the seringal and its entire business, pro- 
ceeds from the Baracao. According to the extent of the seringal, 
from twenty to several hundred work people are employed on it. 
Through the entire forest, paths, known as estradas, are laid out, 
from which all obstructive brush and hanging creepers, are cut 
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