W. Nkilson Jones and M. Chevely Rayner 207 



septatioii into two and three chambers respectively, the cavity of the 

 chambers being filled with delicate parenchyma, in which the ovules — 

 arising parietally in two or three groups on the ovary walls — are 

 embedded. 



For the sake of brevity these two types of ovary will be spoken 

 of hereafter as two-carpellary and three-carpellary respectively, the 

 assumption being made that the number of stigma-branches and of 



Fig. 1 <(. V rtower of B. dioica, vai'. Jl, 

 seen from above, showing tbree- 

 branohed style. 



Drawn with the aid of a camera lucida. 

 X2-6.5. 



Fig. 1 b. Sectional view of ? Uower 

 of B. dioicii, var. B, showing three- 

 branched style. 



Drawn with the aid of a camera 

 lucida. x2'65. 



Fig. 2 II, { flower of B. dioicn, var. G, 

 seen from above, showing two- 

 branched style. 



Drawn with the aid of a camera lucida. 

 X 2 "65. 



Fig. 2 b. Sectional view of ; flower 

 of B. dioica, var. C?, showing two- 

 branched style. 



Drawn with the aid of a camera 

 lucida. >. 2-65. 



ovule groups present in each case correspond to the number of carpels 

 concerned in the formation of the pistil. 



As will be seen from the records below, the same plant may bear 

 both two-carpellary and three-carpellary flowers, but the proportional 

 numbers of the two kinds of flowers are constant, on the average, for 



