SIR J. LUBBOCK—PHYTOBIOLOGICAL OBSERVATIONS. 75 
Here it will be observed that the cotyledons are strikingly like the 
first leaves; and, moreover, that there is a regular gradation from 
the broad ovate colyledon to the final leaves, which are narrow 
lanceolate. The serration of the cotyledons is a very rare cha- 
racter. 
In this connexion also I may perhaps mention Eschseholtzia 
tenuifolia. In my previous memoir I described* and figured 
(l. c. fig. 40) the germination of Æ. californica, in which the coty- 
ledons are long, narrow, and deeply bifid, and suggested that this 
form enabled them more easily to make their exit from the seed. 
In that species, where the cotyledons are deeply bifid, the leaves 
also are much cut up. In E. tenuifolia, on the contrary, both 
the leaves and cotyledons are long and linear. Here also the 
form probably facilitates the exit; and one may perhaps suggest 
that E. californica exhibits a form of which E. tenuifolia repre- 
sents an earlier and simpler condition. 
Connate Petioles. 
In support of the suggestion which I made in my last paper 
with reference to the advantage of petioles being connate, I may 
give as additional evidence the case of Smyrnium perfoliatum 
Fig. 156. 
Seedling of Smyrnium perfoliatum. Half nat. size. 
* Journ. Linn. Soc., Bot. vol. xxii. 1886, p. 359. 
