55 



the tube at b, the insertion of the stamens at c, and the base of the style 

 at d.~5. A transverse section of the ovary, very much magnified, 

 shewing the parietal placentation. — 6. A seed of an Opuntia. — 7. The 

 embryo of the same. — 8. Ripe fruit of a Mammillaria. — 9. A seed. — 

 10. A section of the same. — 1 1. An embryo, with a notch at the end 

 dividing the two cotyledons. 



II. The Gourd Tribe. —1. A stamen-bearing twig of Bryony 

 (Bryonia dioica). — '2. A pistil-bearing twig of the same. — 3. The ripe 

 fruit. — 4. A portion of the cup of a stamen-bearing flower, magnified; 

 a the cup; b a single stamen ; c a double stamen. — 5. A bird's eye 

 view of the lower part of a stamen-bearing flower, with a single anther 

 at a, and two double ones at bb. — 6. A portion of a pistil-bearing 

 flower ; h calyx ; c corolla ; d style ; a ovary. — 7. A transverse section 

 of the ovary. — 8. A seed. — 9. A section of the latter, with the embryo. 



