Elementary botany . Fig. 393- Mature embryo sac (young pro-thallium) of lilium. m, micropylarend; 5, synergids; E, egg; P?i,polar nuclei; Ant, antipodals.(Easter lily.) Fig- 394- Section through nucellus and upper part of embryosac of cotton at time of entrance of pollen tube. E,egg; S, synergids; P, pollen tube with sperm cell inthe end. (Duggar.) GAMETOPHYTE AND SPOROPHYTE. 33 is developing it derives its nourishment from the endosperm (orin some cases perhaps from the nucellus). At the same time

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