206 Mr. Griffith on the Ovulum o^ Santalum, 



in L. globosus it may be supposed to have a partial one in the incorporated 

 albuminous part of the embryo-sac. 



The gradation of structure appears to me to be tolerably complete. One 



modification of Fiscum, in my opinion, tends to show, that in Santalum the first 



steps towards the disappearance of the usual nucleus take place ; Osyris seems 



to me to indicate that a similar tendency may affect the embryonary sac ; and 



Santalum appears to me to allude to a reduction in the embryo-sac to the 



form of that of Osyris. Nor is this all : Osyris has its albumen and embryo 



developed outside that end of the sac to which the pollen tubes are applied ; 



Loranthus bicolor has the same developed outside the opposite end of the sac ; 



ana! the partial development of the albumen in the embryo-sac of Loranthus 



globosus may perhaps be a passage to its development outside that sac in 



L. bicolor. 



The novel points of structure and development indicated in this paper are, 

 so far as I know, the possibility of the separation of a continuous membra- 

 nous embryo-sac into two distinct parts, of which the lower remains un- 

 changed, though it would almost appear from Osyris to be the most permanent; 

 be presence of the embryo-sac not being necessarily connected with its form- 

 ng one of the const.tuent parts of the young or of the mature seed • the 



si::t n °: the embry °- sac by the * *"*» * **- 



of the albumen, e.ther only partially within the embryo-sac, or almost entirely 

 * not qmte so, vtkout it , the confluence of the a.bumina of se tra s^s mi' 



one albumen ; the srawt h nf th„ u • . »evei<u sacs into 



j & "iisunaerstood the observations of M « m -j 



ignorance of those of M Wydler Schleiden, and in 



oritur,: sr^rv ^ *■• *• — » 



mg 

 en grain. 



