442 THE AMERICAN NATURALIST [Vol. LV 



damage to plants in the field and was no doubt highly in- 

 jurious to those in the garden as well. It is planned to 

 repeat the experiment again, using paper pots which may 

 be set in the garden without disturbing the roots at all 

 and without interfering with subsequent growth. (These 

 pots have no bottoms.) 



Garden Cultures have now been carried through four 

 seasons in some lines and through two or three in the 

 others. Pink apricns and pipersmithii have proved en- 

 tirely constant, with one exception. Dark blue apricus 

 also breeds true. 



The striped whites of Pedigree V for three seasons 

 produced both striped whites and dark blues. In 1918 

 the culture produced 28 plants which flowered. There 

 were 20 striped whites and 8 dark blues. In 1919 

 the cultures were so badly injured by transplanting and 

 unfavorable weather that little reliance could be placed 

 on niinilxM's, Some cultures, however, did produce white 

 .plants. In the larger, but still unsatisfactory, ones this 

 sprirm- wliites have again been produced. Although the 

 numbers are very small, the fact that striped whites give 

 ri<e to dark blues, striped whites, and some whites is 

 .-iiinificant. Two cultures of 100 seeds each this spring 

 f)rodu<'ed two white ])hints each and no other sorts. 

 From these data, unsntisfnctrn x ;is they are, it is probable 

 that striped whites arc h.x hrids lictwccn white and dark 

 blue and that white diiVois from dark blue by a single 

 factor. 



The light blues of Pedigree VIII have also been grown 

 through four seasons. In 1918 the original i)lant pro- 

 duced a proa-eny of 85 phuits, of wln'ch 20 were dark blue, 

 60 light blue, nn.l :> f.-iiifw! tn flower. They have never 

 produced any whiter. This x-nsoii 8 cultures out 

 of 27 produced only li-'ht-hlur ph-mts. In most cases 

 the nunihci's w.-n- >in;ill, l.nt otic cnlliuv (.f 200 seeds pro- 

 dncrMl l-ht bin.- nnd i^iw j^hint uhM-h did not flower. 

 Thr<M' ol!iri- n-p.Ttivcly produced 22 iiiiht hlnes out of 

 200 ,,U, is |io!,t hUi(^^ (uit (,f 170 seeds, and 9 light 



