EXPLANATION OF THE FIGURES: 



PLATE IV. 



Fig. I. Pennincrvcd leaf of Qutrcus incana. (a), midrib ; (J), straight secondary 



nerves ; (<:), reticulate tertiary nerves. X f 

 a. Palminerved leaf of Acer caesium with straight primary nerves. X . 



3. Penninerved leaf of Cornus macrophylla, with arcuate secondary nerves. 



X f. 

 4. Leaf of Smilax parvifolia with curved basal nerves. X \> 



(a), broad leaf base; (&), tendrils. 

 5. Penninerved leaf of Cinnamomum Camphora. (a), strongly developed pair 



of lateral nerves. X \- 

 6. Portion of leaf-blade of a Fern, (a), midrib from which spring furcate 



lateral nerves. X \. 

 7. Pedately-parted leaf of Delphinium. X |. 



