CH. II] 



GOURD. 



21 



strikingly different from that in the bean. The cotyledons 

 do not remain inside the seed-coats, they throw off that 



FIG. 5. 

 GERMINATION OP THE GOURD (Cucurbita). 



A, the seed. 



B, the seed laid open, showing the embryo ; one veined cotyledon and the 



radicle are visible. 



C, the radicle has grown out from the micropyle and curved downwards 



geotropically. 



D, the peg or heel has caught on the seed-coat while the growth of the 



arched hypocotyl has nearly freed the cotyledons. 



E, the cotyledons are freed and the hypocotyl has become straight. 



F, the first foliage leaf has appeared. 



covering, emerge from the soil in which the seed was 

 buried, and begin in fact to lead the life of true leaves. 



