346 



FORESTRY INVESTIGATIONS U. S. DEPARTMENT OF AGRICULTURE. 



Table Y.— TREE No. 1. 



No. of dislc. 



II 





IY 



Part of 

 disk. 



Is 

 2s 



Ik 

 2h 



2s 

 lh 

 2h 

 3/t 



n 



28 



u 



2h 



Number of 

 liiiirs. 



30 

 35 

 33 

 34 

 14 

 30 

 33 

 30 

 25 

 13 

 30 

 28 

 32 

 19 



Width. 



( 'm . 



Wafer. 



Pet cent. 

 8.G7 

 8.77 

 8.5G 

 8. 39 

 7 07 

 7 94 

 7.92 

 8. 13 

 7.78 

 7. 57 

 S. 33 

 8.12 

 7 94 

 7.73 







Calculated on woed free 

 from moisture. 





Volatile 



Rosin. 





Vol. hydroc. „ rt/v 

 Roam. 



hydro- 



Volatile 





carbon. 





h>dio- 

 ( ai'bon. 



Per cent 



Rosin. 

 Percent. 





]*?r cent. 



Per cent. 





0. 18 



0.97 



0.20 



LOG 



18.55 



0.1G 



1.21 



0.17 



1. 32 



13.72 



1.08 



G. 01 



1.18 



G.57 



17.97 



0. GO 



3. GO 



GO 



3.92 



36.67 



0. 34 



2. 00 



0.37 



2. 23 



1G.50 



0.30 



2. 07 



0. 32 



2.25 



14.49 



0.31 



2.23 



0.34 



2.42 



13. 90 



0.80 



4.50 



0. 94 



4.90 



iy. xj. 



0. 07 



4.72 



0.73 



5.12 



14.21 



0. 37 



3. 150 



0.40 



3. 57 



11. 22 



0. 20 



1.31 



22 



1.43 



15. 27 



0. J3 



1.41 



0.25 



1. 57 



15. 97 



0. 99 



7.01 



1.07 



7.G1 



14. 12 



98 



6.11 



LOG 



6.G2 



10. 04 



Table VI.- TREK No. 2. 



II 



III 



IV 



2* 

 1A 

 2h 

 3A 

 4h 

 Is 

 2s 

 lh 

 2/i 

 3/t 

 Iff 

 2ff 

 lh 

 2k 



0.18 



3.95 



20 



4.29 



4.56 



0. 2^ 



2.80 



0.31 



3. 05 



10.00 



1.44 



9 25 



1. 53 



10.10 



15. 35 



1.77 



13 05 



1 93 



14.19 



14.41 



1.27 



8. 00 



1.39 



8.78 



15. 75 



1.07 



8.24 



1.1G 



8.94 



12.99 



0. 10 



1 79 



0.18 



1.95 



8.94 



0.22 



2. 06 



0.24 



2.24 



10. 06 



1.25 



8.46 



1.37 



9.14 



14.77 



0.85 



5. 44 



0. 92 



5. 89 



15. 61 



0.80 



6.87 



0.86 



7.40 



11 64 



0.28 



2. 31 



0.31 



2. 52 



12. 12 



0.31 



2. 49 



0.34 



2.71 



12. 36 



1.04 



7.44 



1. 13 



8.10 



13.98 



0. SO 



5. 91 



0.87 



6.41 



13. 53 



Table VII— Summary of Results ov Trkks No*. 54 to 69 and Nos. 17 to 19. 



Serial number of tree*;. 



54, 55, 56, 

 58,59.... 

 63. 64, 65 

 66, 67. 68, 

 17,18,19, 



69 



Volatile hy- 

 drocarbon's. 



Disk II. 



Rosin. 



Per cent 



0.18 



93 



91 



0. 70/ 

 28 

 0.80 

 0.18 

 0.81\ 



i.oor 



14 



0.89 



14 



0. 781 n rt 



0.50J ' 64 



Per cent 



1. 18 



4.97j' ) - 8h 



1.76 



4.06 



1.74 



4.33\- „ 



6. 29 J " 5 " 



1.78 



4.95 



1.49 



2. 47/- M 



Vol.bydr. 

 Rosin. 



X 100 



13.14 



17. 141 ,- r,q 



15.76 

 19. G3 



70. 00 



18 J<)\i(; in 



13.80J l '- ia 



8.00 

 18.00 



9. 56 



19 S2.T ' 



Volatile hy- 

 drocarbons. 



Per cent. 

 ,20 



34J U "' 8 

 20 

 .82 



11 



911 ?l 

 50J U * a 



Disk III. 



Rosin. 



Vol.hydr. t 

 Rosin 



100 



Per cen 

 ,93 



'52)3.89 



,35 

 ,29 



t. 



13.33 



16.82\ 1i 



11.27J 14 ' 



14.14 



19.10 



04 



1. 



3 



I 2 



34 



8.20 

 18.3GJ*- 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 wood of these species 

 varies in strength directly as the weight (little discrepancies being well accounted for by varia- 

 tions in resin contents, which add only to weight and not to strength); that in the same tree the 

 wood varies according to certain definite laws, being heaviest at butt, lightest in top, heavier in 

 the interior, and lighter and weaker in the outer parts of saw-size timber; that thus the age when 

 formed, as well as the position in the tree, exercises a definite influence which is generally far 

 greater than the much-quoted influences of soil, locality, etc. In this latter respect it was clear 



