OF THE COCOANUT DURING GERMINATION oOl* 



l<;xplaiiatioii or I'late 19 



Fig. I. An end view of the cocoanut, without its husk, showing tlic three ciir- 

 pels and the " eyes." The fertile carpel is the one included in the largest angle. 



Fig. 2. A sectional view through the end of an ungerininated nut, with its husk 

 removed, showing the form and location of the germ imi)e(lde<l in the endosp< rni 

 (under the micropyle). The shell is indicated by the heavy outline. 



Fig. 3. Another sectional view similar to that of Fig. 2 showing development of 

 the absorbing organ after germination had proceeded for a few weeks. The incipient 

 stem and roots are to be seen. The cotyledon has enlarged within and without the 

 shell. 



Fk;. 4. A longitudinal section through the whole nut somewhat to the side of the 

 median line. It shows the nut imbedded in its fibrous husk and the conditions found 

 after germination had gone on for about five months. The absorbing organ has filled 

 about two-thirds of the cavity of the nut but has absorbed comparatively little of the 

 endosperm. The stem has proceeded upward through the husk, the roots downward 

 through the husk into the soil. The leaves have been cut oft" above the husk. (See 

 page 350 for appearance of full plumule. ) 



Fig. 5. A section through the layer of the cotyledon normally in contact with 

 endosperm, showing the corrugated, villiform arrangement of the absorbing epithelium. 

 This section having been treated with osmic acid shows the localization of the fat 

 globules. 



Fig. 6. A section through that part of the cotyledon given in Fig. 5. This sec- 

 tion, treated with iodine, shows the localization of starch. 



Fic;. 7. A few cells from the absorbing epithelium of the cotyledon after enlarge- 

 ment. This figure shows the large clear oil globules and the darkly staining starch 

 grains in the subepidermal cells. The crystals seen in most of the cells appear to con- 

 sist of fatty acid, possibly palmitic. 



Pig. 8. Enlarged starch granules from subepidermal cells. 



