the Stems of Succulent Plants. 



37 



On referring 



ir^^^^^"C-l ^^ Parkinson's 

 Outlines of O- 

 ryctology (the 

 only work near 

 at hand on the 

 subject), he 

 there states, 

 when treating 

 of the Phyt6- 

 lithus verru- 



c5sus(^^.20.)) 



that this fossil was a plant of the succulent tribe, differing 

 from vegetables of the present world by its containing a more 

 solid part within its succulent substance, from which proceeded 

 a delicate organisation, by which a communication was pre- 

 served with the external surface." He further adds : — "It 

 also appears that the species of this genus, distinguished by 

 their characteristic markings, may have been numerous ; that 

 the different situations in which the internal part is found in 

 different fossils are attributable to the resolution of the ten- 

 derly organised intermediate part, connecting the included 

 substance with the surface, and to the other accidents depend- 

 ent on partial and irregular decomposition, pressure, and 

 distortion, occurring during its passage from the vegetable to 

 the mineral kingdom." 



M. Steinhauer has also remarked, in speaking of the 

 Phytolithus cancellatus {Jig, 21.), " that the first or epidermal 



Epidermal, Cortical. ^ Ligneous. 



configuration is formed of rhombs, divided by lines forming 



a network in a manner difficult to express by drawings or 



D 3 



