SIR J. lubbock: — PiiYToBror.oaiCAL observations. 



383 



^ 



are thus precluded from growing in leugtli, and in consequence 



scud out two ]ong wings, so tliat they arc divided almost to the 

 base (fig. 111). 



In Shorea, again, the division of tlie cotyledons appears to bo 

 due to an internal j^roccss of the sceJ. I have not, however, had 

 an opportunity of examining a specimen. 



Thr loa 



Fig. 110. 



Fig. 111. 



Fig. 109. Embryo, X 2. Fig. IJO. Section of seod after removal of dorsal 

 surface, embryo, and perisperm, X 2. Fig. 111. Side view of ditto, x 2. 



In Eucalijptus (Jig, 38) we have a different case. The embryo 

 is (witli the exception of the 2)etioles) straiglit or nearly so, 

 ileshy, white, occupying the wliole of the seed, and confurming 

 to it in general outline; the cotyledons are deflexed and convolute 

 round the radicle, whicli the lobes eqnal in length, while half of 



Fiir. 112 



fi 



Embry 



o of Eitcah/ptus Glohiclusi, one cotyledon being cut away. j>, petiole ; 

 p\ cut 'end of petiole; i,l, inner lobe of cotyledon. x4. 



one cotyledon lies over half the other ; one half of each conse- 

 quently lying against the testa. The radicle is stout, fleshy, 

 truncate at the end where it lies against the testa, but otherwise 

 entirely enclosed by the folded cotyledons. The true length of 

 the cotyledon is determined by the distance between the end 

 of the petiole and the opposite pole of the seed. The side of the 

 cotyledons, however, being folded back, that part which lies beyond 

 the petioles is enabled by folding round the radicle tow^den, and 



lA 



Tiounced hourglass shape. 



