104 



BOTANY. 



EXERCISE XLVI. 

 Parts of the Ovule. 



FIG. 327. Growth of Ovule of Celandine. a. Nucleus, b. First-formed covering: 

 c. Second covering, d. Funiculus, very greatly enlarged, e. Base of Ovule. 



BASE OF OVULE. The little stem of an ovule the 

 funiculus has two points of attachment, one to the ovule 

 and the other to the placentae. Now, the base of the ovule 

 is at the point where it is attached to the funiculus, and 

 not at the point where the funiculus is 

 attached to the placentae. 



APEX. The apex of the ovule is 

 opposite to the base. 



PRIMINE. The outer covering of 

 the ovule seen at b, Fig. 327. 



SECUNDINE. The inner covering of 

 the ovule c, Fig. 327. 



NUCLEUS. The substance w r ithin 

 the coverings a, Fig. 327. 



RHAPHE. The connection between 

 the base of the nucleus and the base of 

 the ovule. This is shown in Fig. 328 

 by the fine, irregular lines representing 

 tissue and connecting the base of the 

 nucleus with the base of the ovule. 

 The opening in the coats of an ovule or 

 seed. In Fig. 328 the micropyle is shown at the top of 

 the ovule. 



CHALAZA. The place where the coats and nucleus 

 grow together. In Fig. 328 it can not be distinguished 

 from the rhaphe. 



FIG. 328. Section of 

 the Ovule of Pelar- 

 gonium before fer- 

 tilization. (Magni- 

 fied.) 



MICROPYLE.- 



