There are dangers of transpiration due to other in fliiencea 

 "besides cliniate. Plants may he adapted to dry conditions during 

 part of the year and wet conditions during the remainder. Such 

 plants, according to Schimper, are called troioophytes . 



Hydrophytes are plants which grow in wet soil. 



llesophytes are plants which are adapted to intermediate 

 conditions of moisture. Schimper 's tropophytes do not correspond 

 to Warming's mesophytes. 



Water currents are like air currents in many ways. They 

 favor fertil illation and distrihution of seeds. Water currents Imng 

 aboxit a renewal of air food. is not replaced in stagnant water 

 and the water becomes charged with the acids of decay. Vegetation 

 over stagnant water will show different characteristics from that 

 over running water. Water moving rapidly may cause mechanical 

 injury to the plant structure, hut too strong a current is not as 

 dangerous as stagnant water. 



affects of falling water . 



1. Falling water is the best cleanser of vegetation. 



2. Rainfall supplies water in upper soil layers. 



3. Dew Is a very important ecological factor, 



4. Influence of snow according to Warming and Schimper since it 

 pre-cents excessive evaporation. 



Soil. 

 Soil in its relation to plants is composed not only of soil 

 particles but also of large araoixnts of water and air. Soil is the 



