THE STUDY OF PLANTS IN ANCIENT AND MODERN TIMES. 



11 



and in the parts of the stamens termed anthers " pollen-grains" are developed " in 

 which an extremely pure sap is stored." Adjoining these pollen-producing leaves, 



Fig. 2. — Metamorphoses of leaves as exhibited by the Poppy. 

 •Germinating plant with cotyledons. = and s The same plant further developed and with foliage -leaves; in > the 

 cotyledons and lowest foliage -leaves are already withered. * The same plant with a flower-bud showing the closed 

 sepals. 6 The bud open and with petals, stamens, and carpels (pistil) developed. 



where contraction has reached its extreme limit, is the sixth and last story, which 

 is composed of leaves, once more less closely-set, and exhibiting a final expansion 

 on the part of the plant. These are the carpels, which surround the highest part 



