ILLUSTRATIONS 



Figure p age 



1. Routes of early exploration in Montana 22 



2. Physiographic map of Montana 26 



3. Profile Idaho-Montana topography on the parallel 



48 degrees 30 minutes 30 



4. Profile Idaho-Montana topography on the 46th parallel 32 



5. Profiles of certain mountain ranges in Montana 36 



6. Chart of Montana showing direction of prevailing winds 40 



7. Diagrams showing monthly distribution of precipita- 



tion in Montana.. 44 



8. Mean temperature diagrams for the year. Distrib- 



uted stations 48 



9. Mean temperature diagrams for the year at two stations 



near the same meridian, but 200 miles apart 54 



10. Chart showing temperature, relative humidity and 



precipitation at Missoula, 1911 56 



11. Isotherms for mean temperatures in Montana, 1911.... 60 



12. Forest sectional areas,. 78 



13. Badlands near Glendive, Montana 98 



14. Vegetation of the rimrock near Roundup, Mont 1^4 



15. Alluvial bench along the Musselshell, near Melstone, 



Montana 108 



16. Populus Sargentii along the Musselshell 112 



17. Yucca glauca near Forsyth, Montana 116 



18. Buffalo berry along the Milk River 120 



19. Vegetation on south slope near Havre, Montana 122 



20. Creeping Juniper on plains near Havre 124 



21. Junipers near Boulder, Montana 126 



22. A western slope near Missoula, Montana 128 



23. A high landscape on the East Fork of the Bitter Root.... 130 



24. A southern slope in the Lolo Valley 132 



25. Opposing slopes on the East Fork of the Bitter Root 134 



26. Cercocarpus ledifolius on south-facing bluff 136 



