508 



SOILS. 



different conditions is best seen in the subjoined diagram, 

 showing the upland cypress to assume the form of the tall 

 willow oak, with which it is sometimes locally associated. 



The trees from which the annexed sketch is taken grew 

 within thirty feet of each other, on Yellow creek, a small 

 tributary of the Tennessee river, in Tishomingo county, Miss. 

 The soil stratum is underlaid by a shaly limestone, and bears 

 lime vegetation. 



^fl^l 



Swamp. Upland. 



FIG. 81. Forms of Deciduous Cypress on overflowed and on bench-land. 



The fact that the deciduous cypress grows without difficulty 

 on the moister class of lowlands in California, 12 or 15 feet 

 above bottom water, is of interest in this connection. It then 

 assumes the upland form shown in the figure above, although 

 not growing quite as tall. The calcareous nature of these soils 

 is probably an important factor in this apparently incongruous 

 adaptation of a subtropical swamp tree to arid conditions. In 

 its swamp form the cypress usually grows in rather shallow, 

 heavy clay soil, into the dense subsoil of which the roots pene- 

 trate but little. 



