CHART ILLUSTRATING ZONES OF VEGETATION 



25,000 feet 



VII 



Snow line 



16,500 feet 



Limit of Vegetation in 

 Long. 102°, Lat. 30° 



15,500 feet 



Limit of ligneous 

 Vegetation 



12,000 feet 

 Tree limit 



Limit of Wheat and 

 Barley cultivation 



Snow 

 Eternal 



VI 



Glaciers 



Moraines 

 Cushion Herbs 



V 

 Alpine Zone 



17,500 feet 



Alpine Deserts 

 16,000 feet 



Meadows carpeted 



with Herbs : Primulas, 



Gentians, Cypripediums, 



Meconopsis, Compositse 



Heaths and Moorlands 



covered with scrub : Small- 



ieaved Rhododendrons, Ber- 



beris, Spiraea, Prickly Oak, 



Dwarf Juniper 



Moorlands and Grasslands 



Haunts of 

 Nomadic Thibetans 



Rhubarb and other 

 Medicines 



Larch 



Thibetan and 

 Tribesfolk 



IV 



Sub-Alpine Zone 



Magnificent coniferous Forests 



Headquarters of Spruce family 



Many Rhododendrons 



Forests 



8500 feet 



Limit of Maize 

 cultivation 



III 

 Cool-Temperate Zone 



Mixed deciduous Trees and Shrubs, Rhodo- 

 dendrons, and Conifers. Tall Herbs 

 A wonderful region of Flowers and Autumnal tints 

 Wheat, Maize, and Irish Potato staple crops 

 Varnish trees, Walnuts 



11,500 feet 



Wheat and Barley 

 staple crops 



Timber Lands 

 10,000 feet 



Tachienlu 

 Fine scenery 



5000 feet 



4000 feet 

 Rice limit 



Lilies 



II 



Temperate Zone 



Rain forest. Evergreen region : chiefly Oaks, Laurine^, 

 Hollies, Cunninghamia, Pines, monotypic genera, Ferns, etc. 

 Rice, Maize, Sweet Potato ; much cultivated 



I 



Tea 

 Planta- 

 tions 



2000 

 {eet 



Warm-Temperate Zone 



Highly cultivated. Rice principal summer crop, Wheat winter crop. 



Cypress, Pine, Wood Oil, Bamboos, Palms, Oranges, Vegetable Tallow, 



Insect white-wax. Densely populated 



River level 



Icban 



