. Foundations of botany. iverse character,which live most intimately together to the advantage ofboth parties, may be called messmates, since in some fashion or other they divide thefood supply betweenthem. Bacteria live in col-onies enclosed in root-tubercles on the roots ofcertain plants, for in-stance, beans, peas, lu-pines, vetches, and clover(Fig. 236), and renderthe greatest service tothe plant to which theroots belong, from whichthey also derive food andshelter. Such plants donot develop root-tubercles and will notgrow well in sterilizedsoil, that is, soil in whichthe- bacteria have bee
. Foundations of botany. iverse character,which live most intimately together to the advantage ofboth parties, may be called messmates, since in some fashion or other they divide thefood supply betweenthem. Bacteria live in col-onies enclosed in root-tubercles on the roots ofcertain plants, for in-stance, beans, peas, lu-pines, vetches, and clover(Fig. 236), and renderthe greatest service tothe plant to which theroots belong, from whichthey also derive food andshelter. Such plants donot develop root-tubercles and will notgrow well in sterilizedsoil, that is, soil in whichthe- bacteria have beenkilled by baking. It isfound that the bacteriaserve to change nitrogentaken from the air of the soil into nitric acid, which is amost important ingredient in the manufacture of trees, for example, oaks, beeches, and the cone- 1 This term is borrowed from the zoologists as a much simpler one thansymbionts to express the relation variously known as symbiosis^ commensalism,or mutualism. 2 Sarracenia Fig. 237. —Common Pitcher-Plant.^ At the right one of the pitcher-hke leaves isshown in cross-section. INSECTIVOROUS PLANTS 341
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
