No. 56S] X CAPSELLA BURSA-PASTORIS ARACHNOIDEA 211 



broad and of which the later leaves shall lack incisions 

 reaching to the midrib, a plant, in short, which should 

 have all the characteristics of Shull's simplex. Further- 

 more, on being self ed, it should yield a uniform offspring, 

 in all respects resembling the parent. 



Such plants actually were encountered. Of the plants 

 grown to maturity, twelve were selected as seed-bearers. 

 All bore the simplex character. Ten of these plants were 

 selected from among the first generation of plants of the 

 supposed zygotic constitution BbNn, while one parent 

 (yielding No. 25,712) was derived from a plant bearing 

 the simplex character and another (yielding No. 31,112) 

 was derived from a plant which was shown to have the 

 zygotic constitution bbNn. 



S.U2BRV2P9 



s.-->rj/irt:*/M 

 -."..•/ .'V ■ 



s.-jiLV/r./M 



8.212//K2F6 

 S.-21K! ROI's 

 S.L'r.V/AV./'s 

 8,2\2HR3PQ 



This table offers an excellent illustration of the small 

 danger of an accidental cross, even if the plants are not 

 guarded, always, of course, when the proper precautions, 

 indicated above, are taken. Numbers 26,312 and 30,012, 

 as well as numbers 30,212 and 30,312, respectively, offer 

 instances of uniform inheritance in plants possessing 

 recessive characters only and of which the parents in the 

 one case were left unguarded, in the other caged. Had 



