EXPLANATION OF PLATE. 



Fig.s. 1-11. Leaves of common blackberry, showing mode of variation from a simple to a (i-foliate 

 leaf. 



Figs. 12-24. Leaves of the rose, illustrating developments of leaflets from the stipules. 



Figs. 2.5-29. Leaves of trumpet creeper, illustrating the mode of numerical increase of leaflets by 

 « division of the terminal leaflet. 



Figs. 30-38. Leaves of wild grape, showing the variation from the entire to the deeply-lobed leaf. 



