310 Examination of Matured Framework. 



examination of Tree-ferns would seem to have offered him an 

 occasion for doing so. Von Mohl, like his contemporaries, was 

 satisfied with calling everything that is neither epidermis, cork 

 nor vascular bundle, parenchyma, without distinctly defining the 

 expression. 



Here we leave von Mohl and his labours for the present, to 

 return once more in the following chapter to the share which 

 he took in the further progress of phytotomy. We shall 

 perhaps best realise his importance in the history of the 

 science, if we try to think of all that we have now seen him 

 doing for it as still undone. There would then be a huge gap 

 in modern phytotomic literature, which must have been filled up 

 by others before there could be any further addition to the 

 knowledge of cells and tissues founded on the history of their 

 development ; for it can hardly be conceived that the advance 

 to which we owe the present condition of vegetable anatomy, 

 could have been based upon ideas such as those of Meyen, 

 Link, and Treviranus, without von Mohl's preliminary dis- 

 coveries. 



