. Bollettino della United States Geological e indagine geografica dei territori. La geologia. 70 Bollettino United States Geological Survey. Wol.yi. e 44 specie. Questa relativa preponderanza possono anche essere espressi dagli schemi,, gv che i piccoli rettangoli sbarrato, disegnato sulla stessa scala, rappresentano la con- iferous porzioni di queste foreste. Infatti la foresta del Pacifico è costituito da conifere, con i non-alberi di conifere come oc- sottobosco provvisori (13) o come singoli individui sparsi e evidente solo nelle valli o nella struttura ad albero isparse-crescita delle pianure, su cui le querce al massimo di riprodurre il

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. Bulletin of the United States Geological and Geographical Survey of the Territories. Geology. 70 BULLETIN UNITED STATES GEOLOGICAL SURVEY. Wol.yi. and 44 species. This relative preponderance may also be expressed by the diagrams, , jn which the smaller inclosed rectangles, drawn on the same scale, represent the con- iferous portions of these forests. Indeed, the Pacific forest is made up of conifers, with non-coniferous trees as occa- sional undergrowth or as scattered individuals, and conspicuous only in valleys or in the isparse tree-growth of plains, on which the oaks at most reproduce the features of the " oak openings" here and there bordering the Mississippi prairie region. Perhaps the most striking contrast between the West and the East, along the latitude usually traversed, is that between the spiry evergreens which the traveller leaves when he quits California, and the familiar woods of various-hued round-headed trees which give him the feeling of home when he reaches the Mississipiji. The Atlantic forest is particularly rich in these, and is not meagre in coniferous trees. All the glory of the Pacific forest is in its coniferous trees. Its desperate poverty in other trees appears i a the annexed diagram.. 1. 2. 3. 4. 1. Atlantic American forest. 3. Japan-Mancburian forest. 2. Pacific American forest. , 4. European forest. These diagrams are made more instructive, and the relative richness of the forests, round the world in our latitude is most simply exhibited, by adding two or three simi- lar ones. Two will serve, one for Europe, the other for Northeast Asia. A third would be the Himalay-Altaian region, geographically intermediate between the other two as the Arizona-Rocky Mountain district is between our eastern and western. Both are here left out of view, partly for the same, partly for special reasons pertaining to each, which I must not stop to explain. These four marked specimens will simply and clearly exhibit the general facts. Keeping a

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubjectgeology
• bookyear1874