364 Vegetable Physiology. 



which are merely named here, as it is not within the scope of 

 this work to give any particular account of them. 



Equisetaceje. ^he Scouring Rush Tribe. Ex. Equisetum. 



Lycopodiaceje. The Club Moss Tribe Ex. Lycopodium. 



Filices. The Ferns. Ex. Polypodium, Aspidium, Pteris 

 Adiantum. 



Marsileace^e. The Pepperwort Tribe. 



Musci. The Mosses. 



HEPATiciE. The Liverworts. 



Lichenes. The Lichens. 



Fungi. The Mushrooms. 



CHARACEiE. The Chara Tribe. 



Alqje. The Sea-weeds. 



VEGETABLE PHYSIOLOGY. 



X UMBER TEN. 



REPRODUCTION IN FLOWERING PLANTS. 



The parts of a flower essentially concerned in the reproduc- 

 tive process, are the stamens and pistil. Within the stamens 

 are produced a number of minute yellow bodies, usually of a 

 globular form, which together constitute the fine dust known 

 as the pollen or farina. Each grain of pollen, when examined 

 with the microscope, is seen to consist of a cell exactly analo- 

 gous to the spore of a flowerless plant; It has two or more 

 coats, enclosing a fluid, in which a large number of extremely 

 minute granules may be seen with a good microscope. These 

 granules are probably the germs of new cells. They may be 

 seen to move within the parent cell, or pollen grain, previously 

 to the time when its walls become too thick to allow the gran- 

 ules to be observed through them ; and when the contents of 

 the pollen grain are mixed with water, they are seen to be 

 constantly performing a kind of vibratory motion. The an- 



