. Botany all the year round; a practical text-book for schools. Botany. I20. â Cross seciion of a pome: pi, placenta; c, carpels; f, fibro- vascular bundles. nature will be more apparent on comparing them with a hip, which is clearly only the end of the footstalk enlarged and hollowed out with the calyx sepals at the top. Cut a cross section midway between the stem and the blossom ends, and sketch it. Label the thin, papery walls,, that inclose the seed, carpels. How many of them are there, and how many seeds does each contain.'' The carpels taken together constitute the pericarp, or wall of t
. Botany all the year round; a practical text-book for schools. Botany. I20. â Cross seciion of a pome: pi, placenta; c, carpels; f, fibro- vascular bundles. nature will be more apparent on comparing them with a hip, which is clearly only the end of the footstalk enlarged and hollowed out with the calyx sepals at the top. Cut a cross section midway between the stem and the blossom ends, and sketch it. Label the thin, papery walls,, that inclose the seed, carpels. How many of them are there, and how many seeds does each contain.'' The carpels taken together constitute the pericarp, or wall of the seed vessel. The fleshy part of the apple is, strictly speaking, no part of the seed vessel or ovary proper, but consists merely of the receptacle, or end of the footstalk, which becomes greatly enlarged and thickened in fruit. The word pericarp, how- ever, is often taken in a broader sense, to include all that portion of the fruit which surrounds and adheres to the ovary, no matter what its nature or texture. Look for a ring of dots outside the carpels, connected (usually) by a faint scalloped line. How many of these dots are there ? How do they compare in number with the carpels.'' With the remnants of the sepals ad- hering to the blossom end of the /-â^W V 75. Next make a vertical sec- tion through a fruit, and sketch it. Notice the line of woody fibers outside the carpels, inclos- ing the core of the apple. Com- pare this with your cross section ; to what does it correspond 1 Where do these threads origi- nate .â â Where do they end .' Can you make out what they are.' (See Section 43 ; they are the fibrovascular bundles that connected the veins in the petals. 121. â Vertical section of a pome: p, peduncle; /| fibrovas- cular bundles; j, seeds; //, pla- centa; (,, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfect
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1903
