EXPLANATION OF THE FIGURES. 



PLATE II. 



Fig. I. Diagramatic plans showing the course followed by twining stems, (a), 

 dextrorse stem moving in a counter or anti-clockwise direction ; (&), 

 sinistrorse stem moving in a clockwise direction, z'.<?., in the direction 

 followed by the hands of a clock or watch. 



2. Diagrams showing (a) monopodial branching ; (Z>), sympodial branching. 



In (c), the sympodium, or false axis, has become straightened and has a 



superficial resemblance to a monopodium. (d) (<f), lateral branches 



springing from the leaf-axils. 



,, 3. Twigs of Pyrus Pashia showing the relative development of shoots 



produced in one year. X f - 



Some of the buds (a) (a) have remained dormant, others have produced 

 dwarf spineless shoots (b) (&), others have produced dwarf spiny shoots 

 00 ( c )> an d others have produced long branches (d~) (d~). 



