294 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



of the Linnean Society (1892), and the other in the Annals of Botany 

 (July, 1911). f 



The readers of my last lecture (see pp. 88-94) will remember that 

 the influence of water in the modification of the structure of land 

 plants was fully explained and illustrated by experiments upon the 

 roots, stems, and foliage. We have now seen that precisely the same 

 structures are to be found in terrestrial as well as aquatic Mono- 

 cotyledons ; so that the proofs of the fact that this class has descended 

 from aquatic Dicotyledons rest on a vast accumulation of coin- 

 cidences, such forming a mass of incontestible inductive evidence. 

 Secondly, this is completely verified by experiments. Science requires 

 nothing further for the establishment of truth. 



* A Tlieoretical Origin of Endogens from Exogens, tJiroiigh Self-Ado/ptation 

 to an Aquatic Habit. 



t 2' he Origin of Mo7iocotyledons from Dicotyledons tlirovgh Self-Adaptation 

 to a Moist or Aquatic Habit. 



