•45 i 



l\ CO.NKEliK.NCK INÏKIl.NATKi.NAI.K HK (,KM-.ïlnUK. 



.").{). riial l'or Auicrican l'plands is neai-er to i..". Tlierc are, liowever. difTe- 

 rcnccs liclwt'cii cliffercnl slrainrr. The l'ollowin^ freqiiency curves sliow Uic 

 aniount ol' nuctuation in Iwo pure slrains of Egyplian colton (Fig. I). Tlie F., 

 is inlermediate. and llie F. 5 spreads evenly belween Ihe Iwo parental means in 

 Ijolli famiiics. The F. 5 data are iiol yel available. l>iif alliiougli there is every 

 appearance ol' liomof<eneily in llie F.j graplis, yel wc shall prubably lind 

 segretialiun, under Uic control ol' two or Uiree pairs of allcloniorphs. 



In crosses 

 lielween Ameri- 

 can and Eg-yp- 

 lian. the maller 

 iscloselvsiniilar 

 (Fig. i). The 

 resulls may Ije 

 suni inarised 

 Unis : Ihe F, 

 locuH - lorinula 

 is inlermediate 

 bctwcen those 

 ol' tbc parents : 

 in FjWefindcon- 

 liniious varia- 

 lion lietweenibe 

 Iwo parental ex- 

 trêmes : in F- 

 certain familles 

 breeil Irue. 

 w bile m a n y 

 more bi-eak up : 

 Not only do \ve 

 obtain the pa- 

 rental types 

 again, but also 

 ncw types ^vhich breed equally true (Fig. ." . Apparenlly more Ihan one pair 

 of allelomorphs is concerned in the transmission of tbe cbaraeter. By compa- 

 rison with Ihe simplerbehavionr of the inler-Egyptian crossesit seems clear thaï 

 the inheritance of the characler Iti thèse crosses of reputed species is factorial. 

 There does not appear to be any significant corrélation between the 

 character and any olher peculiarity of Ihe plant. .\ corrélation coelTicienl of 

 about 0.5 bas been found Ijetween diameter of boll and number of loculi, but 

 Ihis is probably due to purely mechanieal causes. Neither is there any 

 séquence of (lucluation on ditVerent portions of Ihe plant, such as bas been 

 found in Ibe stigmalie Ijands of the poppy-capsule, &c. 



Tni; \\ KIGIIT OF TUE SEED. 



The weighl of the seed, from \vhich the tint, has i)een removed by ginning. 

 is subject to considérably more iluctuation tban mosl characters witbin a 

 pure strain. Samples of not less tban '2(111 seeds are weighed and counted in 

 determinin"' Uiis characler. 



100 



Me.iii Seed-Weielit. 



150.7^ 



