the Ovula of Loranthus and Viscum. 75 



part of the process corresponding to the termination of the curved line*. This 

 sac consists of a single cell or vesicle enclosing many grumous, opake, ovate, 

 or angular bodies ; it has a broad attachment, and is the rudiment of the 

 ovulumf. Simultaneously the viscous tissue has made its appearance. 



As the development })roceeds the viscous tissue increases, the sac enlarges 

 and becomes cellular, and its attachment narrower. It soon assumes a broadly- 

 obovate form, its attachment becoming at the same time exceedingly narrow. 

 At this period a vesicle is seen inclosed within the tissue at the commencement 

 of its narrow neck %. This tissue soon assumes the appearance of albumen. 

 The viscous tissue is well developed, occupying the whole of the apex of the 

 fruit (the prolongation of the canal remaining isolated in its centre), and 

 extending to the base of the fruit, to which point it gradually narrows. The 

 figure of the ovarium has changed, four or five prolongations beginning to 

 appear towards its apex. No change has taken place in the process, and the 

 two brown curved lines are still visible. Its stalk, as the albuminous-looking 

 ovulum enlarges, becomes pushed on one side. The ovulum reaches a con- 

 siderable development before any change in the embryo occurs. When its 

 cornua begin to appear, the embryo is globular, cellular, exceedingly minute, 

 and attached to the nipple laterally. It is not entirely enclosed, but lodged 

 in a cavity in the albumen §. 



When the fruit is about half developed, the parietes of the ovarium are in- 

 durated, and its prolongations are very distinct. The ovulum, which has for 

 some time assumed the appearance of albumen, and the form of the ovarium, 

 has 4 or 5 horns corresponding to the prolongations of the former, and as 

 many obtuse angles. The stalk of the process has become detached from the 

 surrounding tissue, except towards its base, and is pushed considerably to one 

 side. The apex of the process is slightly elongated and papillose. The embryo 

 has increased and assumed a more oval form ; it has likewise become central, 

 that is, it occupies the axis of the albumen. As the fruit increases in size, 

 the embryo becomes unequally emarginate at the apex, indicating the first 

 trace of a cotyledonary division|| . No further changes take place in the other 



* Tab. X. fig. 3. t Tab. X. fig. 1. 



X Tab. X. fig. 4. § Tab. XI. fig. 10, 1 1 & 12. 



II Tab. X. fig. 4. & Tab. XI. fig. 14. 



1.2 



