. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. RUBBER RUBBER 555 Although latex occurs in all parLs of the tree, that which is found in the upper branches and twigs is weak and of no value commercialh'. It is therefore from the lower part of the trunk, and, in. Fig. 791. Hevea Brasiliensis, or Paia rubber tree, thirty years old. Ficus, from the aerial roots also, that the rubber is derived. The value of the rubbers of diffe
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. RUBBER RUBBER 555 Although latex occurs in all parLs of the tree, that which is found in the upper branches and twigs is weak and of no value commercialh'. It is therefore from the lower part of the trunk, and, in. Fig. 791. Hevea Brasiliensis, or Paia rubber tree, thirty years old. Ficus, from the aerial roots also, that the rubber is derived. The value of the rubbers of different trees is by no means the same. That of the Hevea is much the most valued, and consequently this tree is the most extensively cultivated of the four mentioned. This seems to be due to the fact that this rubber contains less resin than do the other rubbers. In Hevea there is also a perceptible difference in the quality and quantity of latex obtain- able from different trees. Culture. As there are some important differ- ences in the way that each kind of tree requires to be treated, both in the mat- ter of cultivation and preparation of the rubber, it will be advisable to treat of each kind separately. Because of its importance, and inasmuch as some of the practices employed in raising Para rubber apply to all the others, or will serve to illustrate the general principles, this species is discussed at length. Para rubber {Hevea Brasiliensis). Figs. 790- 793. The Para rubber is a native of the tropical forests bordering the Amazon river and its tribu- taries, where it grows in a damp, hot climate, with a heavy rainfall, and with no distinct dry period. It is therefore suited for those parts of the world which lie close to the equator, and are known as the tropical rain-forest region. It thrives in the West Indies. The temperature at which it grows shows a mean annual of 78° Fahr ; mean maximum, 87° Fahr ; mean minimum, 69° Fahr ; extreme maxi- mum, 93° Fahr ; and extreme m
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