3G0 



SIR J. LUBCOCK: IMITTOBIOLOGICAL OB>SEllVATIONS. 



N'arrow Cotyledons. 



Lot ua now bcgiu with such si^ccies as have narrow cotyk^dons, 

 and fc^ce if we can throw any light on this characteristic, Tlie 



Fig.JS. 



Fig. 41 



^ 



-1. ^^ 



Seedhng of Scvpimlns iiicpqitalis. 



Half nat. size. 



Seedling orBhns Thunhivgil 



HalfTiah size. 



problem is simple enough in such cases as Tlatanus^ where we have 

 on the one hand narrow cotyledons (fig. 8) and on the other hand 

 a long narrow seed (fig. 45, jp) fully occupied hy a straight 

 embryo. Again, in the Ash (Fra:einns^ fig. 4G), Ursinia (fig. 17), 

 &c., tlie cotyledons lie parallel to the longer axis of the seed, which 

 is narrow and elongated. Such cases, however, are comparatively 

 few ; and there are a large number of species in which the seeds 

 are broad and even orbicular, while yet the cotyledons are narrow, 



Men 



tyl 



Men isp erm n m (fig 



