Archive image from page 619 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 ually diminish the yield, if indeed the trees do not succumb altogether. (Hart.) Tapping may begin in the sixth year with Hevea, but much depends on the size of the stem at that age. The rubber from young trees is weaker and lighter than that from older trees, which is valued more highly. It is watery and contains a consider- able proportion of resinous matter, a feature which disappe
Archive image from page 619 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 ually diminish the yield, if indeed the trees do not succumb altogether. (Hart.) Tapping may begin in the sixth year with Hevea, but much depends on the size of the stem at that age. The rubber from young trees is weaker and lighter than that from older trees, which is valued more highly. It is watery and contains a consider- able proportion of resinous matter, a feature which disappears as age advances. The most convenient and satisfactory method of tapping the Para rubber tree is system (Fig. 793). A vertical incision is : i:-: made in the bark from as high as a man can conveniently reach to ; within a few inches of the ground, and as nar- row as possible, as it is required only to con- duct the milk to the cup inserted by its edge at the base of the cut. On either side, sloping cuts are made alternately about six inches apart, connecting with the central cut. The milk runs from these side cuts to thecentral chan- nel and so into the cup. Each day a thin slice is taken off the lower side of each side cut till the milk ceases to flow or till the cut is about one and one-half inches wide, when tapping is stopped and the wound allowed to heal, which it does in about six months. Wounds may be dressed with coal-tar. Tapping is done all the year round, and is best per- formed in the early morning at daylight, or in the evening. The former gives the largest yield. Some growers prefer to tap during wet weather, on the theory that the sap flows faster then, and because the additional moisture delays coagulation and thus facilitates gathering. In dry weather the latex coagulates in the cuts and stops the flow. The instruments used for cutting the bark are very varied, new ones constantly being invented. Especially in old trees, a mallet and a chisel are perhaps the
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