AGRICULTURAL AND MECHANICAL COLLEGE or TEXAS. 



45 inches are found the swamp and bayou forests of cypress and tupelo, 

 and, on better drained bottomlands the forests of white oak, gum, wal- 

 nut, magnolia, holly and other moisture-loving species. On somewhat 

 higher lands within the humid zones are found the pines. Passing west- 

 ward to a slightly decreasing zone of rainfall one encounters the upland 

 type of post oak and in Central Te^as, where the rainfall is reduced 

 to 25 or 30 inches, the Atlantic flora disappears except along the stream- 

 ways and such species as mountain cedar, cedar elm and mountain oaks 

 come into prominence. Approaching arid sections shrub-like forests 

 with numerous leguminous and drouth resisting forms of vegetation 

 predominate. 



Temperature. 



In a State having such wide variations in latitude and elevation, tem- 

 perature records must likewise show wide differences in various portions 

 of the State. In average yearly temperature the valley of the lower 

 Eio Grande is considered to differ as much from the northwestern por- 

 tion of the Panhandle as does New Orleans from Chicago. The dif- 

 ference in latitude between Northwest or even any part of North Texas 

 and the Gulf Coast controls in a large measure not only the crops which 

 may be grown, but the general types of trees and other vegetation found 

 under natural conditions. On the whole, the trees which compose the 

 forests of Texas are those of the southern part of the United States. 

 Species are common along the Gulf Coast and in the Eio Grande Coun- 

 try which are not frost hardy farther north. Many species common 

 to the Middle States, however, are often found and may be grown to 

 the southern limits of Texas. In the high mountains of West Texas 

 are species characteristic of the Eocky Mountains. Temperature is an 

 important agency governing tree distribution. 



For the information of the prospective tree planter and the general 

 reader the following temperature records of various Texas Weather 

 Bureau Stations for periods of years are given below: 



LOWEST TEMPERATURES. 



