_i 1.'. J -is 



Calmla), the anthers are confined in ten cavities in the corolla : at the 

 proper season they are disengaged, and thi-o'A-n forcibly' against the stigma, by the 

 elasticity of the filaments. In Monoecious and Dioecious plants, where the sta- 

 Hiens arj placed apart from tlie pistils in different flowers, the pollen is often con- 

 '*-eyed to the pistil by insects in going from flower to flower in search of honey. 



93. Soon after the pollen falls upon tlie stigma, the outer coat 

 of eticli granule bursts (70, a) at one or more points, alioAv^ing 

 the inner coat to pass througli it in the form of a tube. This 

 tube insinuates its<jlf between the 'Cells of tlie stigma, and 

 passes doAX'^n between the loose cells of tlie style, extending 

 jtself imtil it reaches the ovar}', even when the style is of con- 

 sideral.ile length. When these tubes reach the ovaiy, they 

 direct themselves towards the ovules in different parts, and 

 enter the foramen, which at this time is tunicd towards the 

 base of the .style, and brot'tght in contact with its conducting 

 •tissue (83). 



94. As to the fiirther actiovi of the pollen grains, it is conjec- 

 tured that the molecules which they conta'^- ^6'9, a) are conveyed 

 by the tubes into each ovule, and that there developing them.- 

 selves into new ceils, and becoming fixed in their places, they 

 constitute the embryo of the future [)laut. All that is certainly 

 known, however, is, that the embryo first appeoj-s in the ovule 

 shortly after tlie pollen tube enters it 



CHAPTER VII. 



THE FLOWEIL 

 §5. OF THE CALVX. 



95. The tenn cal't/x comes from the Greek, and signifies a 

 cuj). It is applied to the outer whorl of the floral envelopes, in 

 refere ice to its common form and position. It is generally 

 gi'een, but is sometimes colored, that is, it is of some other coloi 

 than green. It seems designed for the protection of the more 

 delicate organs of the flower in estivation (in the bud).) 



96. The divisions of the calyx are called f^epah, which ^-fc 



