. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 0 20 0. 2^ 3. 05 9 25 13 05 1 93 8. 00 1 79 2. 06 11 64 2. 31 0. SO 5. 91 Table VII—Summary of Results ov Trkks No*. 54 to 69 and Nos. 17 to 19. Serial number of
. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 0 20 0. 2^ 3. 05 9 25 13 05 1 93 8. 00 1 79 2. 06 11 64 2. 31 0. SO 5. 91 Table VII—Summary of Results ov Trkks No*. 54 to 69 and Nos. 17 to 19. Serial number of tree*;. 54,55,56, 58, 63. 64, 65 66,67. 68, 17,18,19, 69. Volatile hy- drocarbon's. Disk II. Rosin. Per cent 93 91 0. 70/ 0 28 \ 0 14 0 14 0. 781 n rt '64 Per cent 1. 18 ')-8h \- „0 J0"5" 2. 47/- M Rosin. X 100 17. 141,- r,q 19. G3 70. 00 18 J<)\i(; in '-ia 9. 56 19 ' Volatile hy- drocarbons. Per cent. ,20 34JU"'8 20 .82 11 9110 ?l 50JU* a Disk III. Rosin. t Rosin 100 Per cen ,93 '52) ,35 ,29 t. \1i ' 04 1. 3 I 2 34 *-1 Timber Physics Work. The timber physics work was continued actively and the investigation extended to other kinds of timber, both conifers and hard woods, hi 1896 the Division was in position to announce its findings with regard to the mechanical, physical, and structural study of the four principal Southern pines (Circular 12). Based, as these results are, on over 20,000 mechanical tests and over 50,000 weighings and measurements, they may fairly be regarded as final, and thus avoid future discus- sion and much fruitless and expensive private testing. According to this exhaustive study, the Cuban and long-leaf pine rank foremost among our timber pines, and are fully 20 to 25 per cent stronger than had previously been assumed. It also appeared that the woo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
