156 WATER. 



with loose distended cellular tissue, as in the mesembryan- 

 themum, while in those furnished with abundant pores, the 

 tissues are more compact and rigid. 



Some plants will live only in moist situations, while others 

 will avoid such localities and flourish in dry sandy situations. 

 The Fungi requiring moisture are sent forth in profusion un- 

 der circumstances in which the Arenarias would perish from 

 the abundance of moisture. 



END OF PART I. 



