(a-ir) 



(air) 



vafer 



(air) 



Fig. 6. li. hcterophyUus. Seedlings raised in an open border, bearing 

 dissected foliage adapted to air. On being transferred to water 

 these leaves perished, but others adapted to water were developed 

 instead. Subsequently, the floating type appeared, followed by 

 flowers in air. (See p. 34.) 



[To face page 34. 



