CALYX. 45 
laurel (Kalmia), the anthers are confined in ten cavities in the corolla; at the 
proper season they are disengaged, and thrown forcibly against the stigma, by the 
elasticity of the filaments. In Moneecious and Diccious plants, where the sta- 
mens are placed apart from the pistils in different flowers, the pollen is often con- 
veyed to the pistil by insects in going from flower to flower in search of honey. 
93. Soon after the pollen falls upon the stigma, the outer coat 
of each granule bursts (70, @) at one or more points, allowing 
the inner coat to pass through it in the form of a tube. This 
tube insinuates itself between the cells of the stigma, and 
passes down between the loose cells of the style, extending 
itself until it reaches the ovary, even when the style is of con- 
siderable length. When these tubes reach the ovary, they 
direct themselves towards the ovules in different parts, and 
enter the foramen, which at this time is turned towards the 
base of the style, and brought in contact with its conducting 
tissue (83). | . 
94. As to the further action of the pollen grains, it is conjec- 
tured that the molecules which they contain (69, a) are conveyed 
by the tubes into each ovule, and that there developing them- 
selves into new cells, and becoming fixed in their places, they 
- constitute the embryo of the future plant. All that is certainly 
known, however, is, that the embryo first appears in the ovule 
shortly after the pollen tube enters it. 
CHAPTER VII. 
THE FLOWER. 
§5. OF THE CALYX. 
95. THE term calyx comes from the Greek, and signifies a 
cup. It is applied to the outer whorl of the floral envelopes, in 
reference to its common form and position. It is generally 
green, but is sometimes colored, that is, it is of some other colon 
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 sepals, which are 
