GoRHAM, on the lJnihelUfer(B. 



19 



curious anomaly, as I supposed, of a vein which seemed to be 

 situate at the very margin of the leaf, but which was espe- 

 cially visible at the edges of its lobes. The question natu- 

 rally arose whether the supposed vein was a vein at all, or 

 whether the appearance was due to a thickened state of the 



margin of the leaf. 



Tig. Ill, — Leaflet of Mthusa Cynapium. 



Showing the primary veins (p, p), the proper veinlets (v, v, v) 

 proceeding from the primary veins, bifurcating at the sinus or 

 angle of the lobes (s, s, s), and becoming confluent with a vein 

 which entirely surrounds the leaf at its very edge or margin, form- 

 ing the marginal-veined leaf. 



Happening to have by me a dried specimen of a leaf from 

 the same species, which had been left accidentally in a 

 manual of botany many years since, I submitted this leaf to 

 examination, when I discovered that the supposed veins 

 could be seen distinctly, and could be traced without trouble 

 to the sinus of two adjacent lobes, where they met with a 

 single vein proceeding from the interior of the leaf, and 

 which bifurcated and became confluent with them.* The 

 next leaf which came under notice was that of the CEnanthe 

 crocata (water dropwort). (PI. III.) In this leaf the actual 

 existence of the vein was even still more evident, and a smaller 

 veinwas seen clearly to proceed to the angle of the lobes, there 

 to divide into two portions, which emerged and traversed the 



* See mounted specimens. 



