SIR J. LUBBOCK—PHYTOBIOLOGICAL OBSERVATIONS. 87 
rapidly than the lamina; and, lastly, the growth of the stipule is 
arrested while the leaf attains a considerable size. The terminal 
portion of the young leaf seems narrower in fig. 174 than it is in 
Fig. 176. 
> 
Fig. 175. Almond-shaped body on and under a glass. 
Fig. 176. Diagram showing arrangement of the young leaf. 
the leaf; but it must be remembered that it is to some extent 
curved round the inner stipule, so that in the figure it is 
somewhat foreshortened. 
It might be suggested that the form of the leaf determines the 
bud. But in fact the form of the bud is not that of the leaf ; 
the leaf follows, not the form of the bud, but that of the vacant 
space left in the bud. 
I think that the explanation I have suggested accounts for all 
these points, and beautifully explains the peculiar form assumed 
by the leaf. 
Since this was written, our Secretary Mr. B. D. Jackson has 
kindly called my attention to a note by M. Godron, “ Observations 
sur les Bourgeons et sur les Feuilles du Liriodendron tulipifera ” 
(Bull. Soc. Bot. de France, 1861, p. 33). M. Godron clearly 
describes the arrangement and form of the buds of Ziriodendron. 
He attributes the square termination of the leaf to the fact of its 
abutting against the base of the bud. He does not give any 
suggestion as to the projecting point at the midrib, or the 
peculiar saddle-like shape of the leaf. 
