. Bulletin (Pennsylvania Abteilung der Forstwirtschaft), No. 11. Die Wälder und die Forstwirtschaft. 19 Platte VII. Blumen und Blüten sowie deren Anordnung. 1. 3! 4. c. 7. 8. 9. 10. 11. Ich weiss'ine (staininatc Verwirrung warfen), x J. WEISS ICH'ine CJ. pistillate), x J. Willow (staminate anient), x I. Willow (pistillate anient), x Ich. Walnuss (staminate anient), x Ich. Nussbaum <a pistillate Blume), erweitert. (Ilicliory staminate Ament), x 1. (A pistillate Ilitkory Blume), natürliche Größe. Bireh (a staminate araent), x h-Wivrh (a pistillate Ament I, x I I'. Ich'ech (a staminate Kopf), x J. 12. Bier-h (zwei pistillate Blumen), natürliche Größe.

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. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 19 PLATE VII. FLOWERS AND FLOWER ARRANGEMENT. 1. 3! 4. c. 7. 8. 9. 10. 11. White I'ine (staininatc fluster), x J. White I'ine CJ. pistillate), x J. Willow (staminate anient), x I. Willow (pistillate anient), x i. Walnut (staminate anient), x i. Walnut <a pistillate flower), enlarged. Ilicliory (staminate ament), x 1. Ilitkory (a pistillate flower), natural size. Bireh (a staminate araent), x h- Wivrh (a pistillate ament I, x I. I'.i'ech (a staminate head), x J. 12. Beer-h (two pistillate flowers), natural size. 13. Chestnut (a staminate ament), x J. 14. Chestnut (a pistillate ament), x I. I't. White Oak (4 staminate aments). x J. Ifi. White Oak (a pistillate flower), enlarged. 17. Elm (3 clusters of incomplete flowers), x i. 15. Mulberry (a staminate spike), x i. 19. Mulberry (a dense pistillate spike), x i. 20. Tulip Trt'e (a complete flower), x i. â -'1. I'apaw (.1 coniplete flower), x J. 43 estimated that the lower leaf surface of Black Walnut contains about 300, 000 per square inch. The leaf is not only peculiarly modi- fied for the reception of light and the absorption of gases, but also for the loss of water. This process of losing water in the form of vapor through the stomata is known as transpiration. The large amount of water given off by trees is usually not appreciated. The Austrian Forest Experiment Station has published data which show that an open-grown birch tree with 200, 000 leaves transpired on hot summer days from 700 to 900 pounds. Assimilation, the fourth of the functions named above, comprises a series of changes which are necessary to transform the raw or newly manufactured food material into actual plant tissue. 6. Leap-scaes and Bundle-scars: Most of our trees and shrubs, except the cone-bearers, shed prac- tically all their leaves in autumn. Those which shed their leaves in this manner are known as deciduous trees, while those which re- tain them for two or m

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• bookcentury1900
• bookdecade1900
• booksubjectforests
• bookyear1901