ILLUSTRATIONS. 



PLATES. 



Plate I. LongleafPine(P;"HSj)a7»3(Ws) Frontispiece. 



II." Fig. 1.— Long-leaf Pine forest in Louisiana Hats, virgin, scorched l.y lire, as usual; Fig. 2.— 



Longleaf Pine forest after removal of merchantable timber -" 



III. Map showing distribution of Longleaf Pine and Cuban Pine 30 



IV. Piiiiis palustiis, bud and leaf ^" 



V. Piiiun paluslris, male and female flowers '■'- 



VI. Pinut iialustriK, cone and seed •^■' 



VII. Pinm paJmtiU, seedlings and young plant ^-^ 



VIII. Turpentine orcharding in Louisiana - ^^ 



IX. Ci?ban pine flatwoods of Florida " 



X. Pinus UeterophiilUi, male and female flowers *- 



XL PUnis heiei-ophyllii, cone and seed **' 



XIL Shortleaf Pine {Phitis echinnta), forest grown specimens in Missouri 91 



XIII. Shortleaf Pine (/•;»«» echiiiata), a roadside specimen in North Carolina 'J- 



XIV. Map showing distribution of Shortleaf Pine -'r! 



XV. Phi us (chiiiitta seedling; male and female (lower, and leaf sections 100 



XVI. i'i/.Jts irhiiKita cone, seed, and leaves 10- 



XVII. Loblolly Piiii'i /■;/.». hidu) n:.! 



XVIII. Mapshowin.^ .listiiljiition of Loblolly Pine 11« 



XIX. Pinus tiiilii. liialr ilowris and leaves -. 1-- 



XX. Piuus tdiUi, feuiuli! llowers, cone, and seed 1-^ 



XXI. Typical cross sections of Piiins taida, heterophijlla, and f/laira 151 



XXII. Typical cross sections of Phius palustris and echinata, and radial sections of Pinus palnsiris and 



ghibra 1^6 



XXIII. Radial sections o( Pimis echinala and keterophijlla loi^ 



XXIV. Radial sections of P.i/hs Uvda and tangential sections of Pinus palustris and ivliiuala IGO 



XXV. Tangential sections of Pinus Uedn, heleniphi/Uii, and i/labni Ifi2 



XXVI. Tangential sections of Pinus ichinata. heierophylla, and yUilira, showing number and distribution 



of pith rays and jiroportiou of pithray cells 1''' 



XXVII. Transverse resin ducts— tangential views l*^'*" 



FIGURES. 



Fig. 1. Diagram showing variation of weight with height of tree 1'' 



2. Schematic section through stem of Longleaf Pine, showing variation of specilic weight with height, 



diameter, and age at 20 {ahn ), 60 (rfcrf), 120 (ceec ), and 200 UJfJ') years H 



3. Diagram showing variation of compression strength with nioisture 10 



4. Diagram showing loss of water in kiln drying and reabsorption in air, shrinking and swelling 20 



5. Diagram showing comparative progress of height growth in average trees 22 



6. Diagram showing comparative progress of diameter growth in average trees 23 



7. Diagram showing comparative progress of volume growth in average trees 24 



8. Growth of Longleaf Pino in height, diameter, and volume CO 



9. Tools used in turpentine orcharding - '^ 



10. Improved method of turpentine orcharding '1 



11. Growthof .Shortleaf Pine ^07 



12. Growth of Loblolly Pine 1-'' 



13. Variation of suiumerwood per cent irom pith to bark 1^6 



14. Variation of specific gravity with summerwood per cent and age of section 1^7 



15. Variation of summerwood per cent with rate of growth (width of ring) 1^8 



16. Schematic representation of coniferous wood structure 1^9 



17. Cell endings in pine _' 



18. Cross section of normal and stunted growth !•* 



