. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XV. Xo. 357. THE AGRICULTUKAL NEWS 13. PHYSIOLOGICAL EFFECTS ON HEVEA BRASILIENSIS PRODUCED BY TAPPING. Bulletin No. 1:2 of the Department of Agriculture, ?Ceylon, dealt with descriptions of, and yields of rubber pro- duced by, various systems of tapping carried out at the Experiment Station, Peradeniya, during 1911-1-3. The present lUilletin (No. 19) for -July 191-5, is to be regarded as complementary to Bulletin No. 12, and contains the results of the examination of the trees with regard to the relative quan
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XV. Xo. 357. THE AGRICULTUKAL NEWS 13. PHYSIOLOGICAL EFFECTS ON HEVEA BRASILIENSIS PRODUCED BY TAPPING. Bulletin No. 1:2 of the Department of Agriculture, ?Ceylon, dealt with descriptions of, and yields of rubber pro- duced by, various systems of tapping carried out at the Experiment Station, Peradeniya, during 1911-1-3. The present lUilletin (No. 19) for -July 191-5, is to be regarded as complementary to Bulletin No. 12, and contains the results of the examination of the trees with regard to the relative quantities of reserve food stored in the bark and wood in, and at various distances from, the tapped areas. The tapping systems employed are divided into three classes in accordance with the arrangement of Bulletin No. 12, viz.: (1) tapping on one-third circumference; (2) tapping on alternate days versus daily tapping on alternate months; (.3) pricking methods. With regard to (1), the e-icperiments were carried out between July 1912 and December 1913 as lollows. 78 A—Four cuts one foot apart to the left of the channel. Tapping over one-third of the tree's circumference and was carried out twice per week. 78 B— Four cuts one foot apart to the left of the channel. Tapping extended over one-third of the tree's circumference and was ?carried out once per week. 81 A—Two cuts one foot apart to the left of the channel. Tapping extended over one-third of the tree's circumference and took place three times per ?week. 81 B—Two cuts two feet apart on one-third of the tree's circumference. Tapping took place three times per ?week. 81 C—One cut at three feet from the grrmnd. The tree was tapped on one-third the circumference six times per week. 82 B - Three cuts one foot apart to the right of the channel and one-third of the tree's circumference- The tree was tapped three times per week. The results are summarized as follows:— 78 A and 78 B. 'In one case the tree had been
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