Southern field crops (exclusive of forage plants) . -ljrid, orcrossed, plants. Glanrh. — Glands, or minute organs secreting a sweetish sub-stance, are found both on thf flowers and lea\es of cotton. Inthe flowers of American cottons there are glands at the base ofthe bracts and also at the base of the petals. On the under side ofthe leaves the glands occur on one or more of the mid-ribs or glands are probably means of attracting insect visitors andthus of increasing the amount of crossing between varieties orbetween individual plants of cotton. 236. Bolls (Fig. 127).—The pod containi
Southern field crops (exclusive of forage plants) . -ljrid, orcrossed, plants. Glanrh. — Glands, or minute organs secreting a sweetish sub-stance, are found both on thf flowers and lea\es of cotton. Inthe flowers of American cottons there are glands at the base ofthe bracts and also at the base of the petals. On the under side ofthe leaves the glands occur on one or more of the mid-ribs or glands are probably means of attracting insect visitors andthus of increasing the amount of crossing between varieties orbetween individual plants of cotton. 236. Bolls (Fig. 127).—The pod containing the seedand lint is called the Ixjll. In short-staple cotton, there. 258 COTTOX STltUCTCBE 259 are usualh four or five dmsions of each boll; the contentof each division is called a lock. While upland Americancottons, both long- and short-staple, have usually four orfive locks, a boll of Sea Island cotton contains only threeor four. In tests made at the Alabama Experiment Station,bolls with five locks afforded a larger yield of seed cottonto the boll than did bolls having onlj- four locks. The numljer of bolls varies somewhat with differentvarieties, but is chiefly dependent upon conditions of fer-tility, rainfall, and climate. The number may varj be-tween a few and several hundred on a single plant. Afield averaging 50 mature bolls per plant usually makesconsiderably more than a bale of cotton (500 pounds oflint) per acre. Cotton plants of medium size, 3 to 5 feethigh, are apt to Ix more heavih fruited in proportion tosize than very large plants. Short internodes, or spacesbetween branches, are favorable to productiveness. Anideal cotton plant should h
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