[33]

(47

Utricularia

that the valve is formed by the infolding of the medial part of the dorsal surface of the bladder; & the rim collar by a similar infolding of the ventral surface.   I believe that at this early age the valves & collars are do not cohere in any part.  When the one of these very young bladders was viewed from obliquely above, a distinct change in the nature of the tissue, could be seen at the corner of the elliptical orifice, where it infolded dorsal & ventral surfaces unite an are joined , showing that they are essentially distinct.  Hence

From these facts, & considering  from  the bi [illeg] of  bifurcation of  the vascular tissue I believe to bladder is found by the edges of  the vessels at the base of the bladder  

I conclude that it is formed by      two divisions of the a leaf having coalesced in the lower parts.   by their edges.)

(The division of the leaves whilst very l young are flat & thin, & curve round the centre of the

[33v]

[mathematical notes by George Darwin]