Plants and their ways in South Africa . Fig. 48.—Pine seedling. Cut back the roots and replant a thrifty Acorn new shoots have formedrepeat the operation several another seedling growing tocompare the growth. The Japanese have long beenfamous for their secret of pro-ducing dwarf trees. Oaks, overa hundred years old, grow com-fortably in a small pot. Maybeif you bear this law in mind youmay discover their secret—or anew process. According to this law, if one p,^ and small leaves part of a plant grows to a large of Carissaferox, size it does so at the expe
Plants and their ways in South Africa . Fig. 48.—Pine seedling. Cut back the roots and replant a thrifty Acorn new shoots have formedrepeat the operation several another seedling growing tocompare the growth. The Japanese have long beenfamous for their secret of pro-ducing dwarf trees. Oaks, overa hundred years old, grow com-fortably in a small pot. Maybeif you bear this law in mind youmay discover their secret—or anew process. According to this law, if one p,^ and small leaves part of a plant grows to a large of Carissaferox, size it does so at the expense of other parts. The leaves on. 44 Plants and their Ways in South Ajrica horizontal branches of Carissa ferox, show this. They arearranged in pairs. The leaves which are exposed to the light arelarge, while the alternate pairs at right angles to these are notso well placed to receive the light and, perhaps for this reason, orbecause the pair on either side have developed at their expense,they remain much smaller. Other examples of the same naturemay be seen in the study of flowers, where one whorl is oftendeveloped at the expense of another. In the ray flowers ofCompositae, where the corolla is conspicuous, the stamens arewanting; this may give a chance for the ovaries to develop orthey too may be sacrificed, as in the sunflower. While in theless conspicuous disk flowers where the stamens develop, theovaries may fail to form fruit as in Othonna, Osteospermum, andEriocephalus. On page 17 a correlation was found to exist between thedevelopment of root hairs and the supply of moisture. CHAPTER VI. A STUDY OF LEAVE
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1915
