12. September 22, and the buds are formed for the next year's crop
Finally the apple is ripe and ready. At the stem end is the "cavity," a depression, deep or shallow, according to variety, in which the stem is set. At the blossom end is the "basin," also with the characteristics of the variety as to depth and width and contour, in which the calyx-lobes persist, and inside the calyx are the remains of the dead stamens and styles; the calyx may be "closed" or "open," the character being a mark of the particular variety.
Cut the apple through the center lengthwise (Fig. [13]); note the curved outline of the core (the pistil) extending half or more across the fruit; if you do not see this outline, cut an apple until you do; carefully open the five cells or compartments and within the parchment walls find the two seeds attached by their points which are directed toward the stem end; perhaps one of the seeds has failed, but probably a cavity marks its place; perhaps both seeds have failed; perhaps the cell has more than two seeds.
13. The apples in section
Cut an apple cross-wise: note the five radiating cells of the core, the number and attachment of the seeds; note the ten points, imbedded in the flesh, marking the outline of the core. Cut an apple cross-wise above the core and beneath it; note where these points vanish and try to harmonize them with the core-outline as seen in the lengthwise section; probably you will discover why you may not see the core-outline in all the lengthwise sections you make. Before you leave the fruit, note whether single seeds in a cell are the same shape as the two seeds in a cell.
The flesh outside the core-outline is interpreted to be stem structure rather than pistil structure. Sometimes an apple bears a scale-like leaf on its exterior, suggesting that the outer part of the fruit is stem. The older morphologists interpreted the apple flower to comprise a hollowed calyx (calyx-tube) inside which is the pistil and on the rim of which are the petals and stamens. The structure now is regarded as a hollowed receptacle or stem (hypanthium), with the pistil inside, the petals and stamens on its rim. We noted in the flower that the ovary part of the pistil is solidly imbedded in this receptacle, but that the five styles are free. The pear and quince are of similar structure, but the peach, plum and cherry are simple ripened pistils.