The cotton plant in Egypt, studies in physiology and genetics . of length, and the Fo curvewas almost symmetrical between the parental extremes(Fig. 70). Subsequent generations have shown that pure parentallength can be extracted, while new intermediate lengthsmay also breed true. Dissection of the F2 revealed a similar series ofphenomena to those shown by seed-weight. In this case,the most definite result was obtained by grouping to seed-weight ; the 28 largest seed-weights had a mean lint-length which was 5*9 per cent, above the general mean,with modes at 26|- and 32 mm., the form of the dis
The cotton plant in Egypt, studies in physiology and genetics . of length, and the Fo curvewas almost symmetrical between the parental extremes(Fig. 70). Subsequent generations have shown that pure parentallength can be extracted, while new intermediate lengthsmay also breed true. Dissection of the F2 revealed a similar series ofphenomena to those shown by seed-weight. In this case,the most definite result was obtained by grouping to seed-weight ; the 28 largest seed-weights had a mean lint-length which was 5*9 per cent, above the general mean,with modes at 26|- and 32 mm., the form of the dis-section being that of the 3 : 1 type (Fig. 70). Conversely,the 27 smallest seed-weights were 59 per cent, belowthe mean general lint-length, with modes at 21 and27 mm. It thus seems highly probable that lint-length is alsoinherited simply, in spite of the seeming complicationof the Charara x King second generation. Miscellaneous.—All the characteristics mentioned inthe chapter on Fluctuation have been made the subject of 174 THE COTTON PLANT IN EGYPT 20 30 40mm Fig. 70. -Mean Maximum Lint-Length. IX HKkEDITY 175 statistical records in the ordinary course of routineobservations. Thus we possess the curves for growth,flowering, boiling, and shedding for almost every indi-vidual studied. Data for weight of lint per seed, and forginning out-turn are also to hand, but the majority ofthese records are of more value as supplementary sourcesof information in physiology than from the standpointof Genetics. At the same time, they are frequently ofinterest as showing the commercial resultant of thoseconflicting gametic forces whose lines we have endeavouredto trace. SECTION IV CHAPTER X ECONOMICS Within the limits of this volume we can do no more thanglance at the many matters of economic interest to whichthose researches are linked. Their most direct and im-mediate application has been found in the Sub-Soil Watercontroversy, from which many of the inquiries attemp
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