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Show CHAP. III. MIMU L US LUTE US. 7 4 1 superior in height as 100 to 92. vVe thus see hoew . iinmtemrcernosses eYd and ~o .t h e se lf-the Chelsea-crossed are to th t show their supenorJty whc~ . . . d lants. They began o hen fully grown, muc fm 1tl hosne e ~In ch h1' g h · They were alsnod, ws omew1 1 a t l"a rger flowers on ~o bmnchcd with larger leaves) tA so that ifthey had been :~'n the plants of the othe~~=~~ ~a~c been much higher tban . hed the ratio would cer weJg f 1'0o to 56 and 52. t tho self-fertilised in that o 1 ts are here o · t The intercrossed pan " . the analogous expenmon 100 t 92. whereas In 1 t from the self-h? ighti·nas Table ~rx: the intercrots.sendw~:: i:ferior in height given · th genera 10 110 I fertilised plants o~ the SIX , . the ratio of 100 to . to the s<jlf-fertihs~d p~ants In co in the results of th~ two doubt whether this dis.~or:~n the self-fertilised plantR In tho experiments can be cxplame \cd from spontaneously Rei~ resent case having bee.n ra~ former case they wore rmso fertilised seeds, wherea~ .m theeds . nor by the present plants f1. 0 m artificially self-fertilised s. . two additional generatiOns, lf f rtilised d unng having been so ~ e bl xplana tion. though this is a Inore pr??a ~l~e twenty-eight Chelsea-crossed With respect to fertility, . he twenty-seven intercrosscd phtnts produced 272 caps~les' !nteen self-fertilised plants 17 plants produced 24; and t e ~ef~ uncovered so as to be naturally All the plants were e d capsules. les were rejecte . fertilised, and empty capsu Ca1Jsules. ld have produced 194·29 Theref ore 20 Chelsea-crossed plta nts wou " 17 · 770 20 Intercrossed plan s " , 20·0 " 20 Self-fertilised plants " Grains. " } The seeds .contained in 8 capsules f rom tho Chol.sea- 1 ·1 crossed plants weighed · 1 f. om the Intorcrossocl l o·.51 The Sleds contained in 8 ca psu es r . • . ~ plants weig~ed . · ~les f;om the Self-fertilised l o·33 Tbe seeds contamed In 8 caps . . . ~ plants weighed . . . d d too·ether with If we combine the numb or~ f capsuleds ptwoe ugceot theb fo.l lowlD. g tho a verago wm.g h t of contained see s' oxtraordi~ary ratios: ced b the same number } as 100 to 4 \Veigh t of seed procldu d . ~ tercrossed plants • of Chelsea-crosse an l CHAP. III. FLOvVERS ON SAME PLANT CROSSED. 75 Weight of seed produced by tho same number } as lCO to of Chelsea-crossed and self-fertilised plants 3 vVeight of seeds produced by the same number } as lOO to of intorcrossod and self-fertilised plants . . 73 It is also a remarkable fact that tho Chelsea-crossed plants exceeded tho two other lots in hardiness, as greatly as they did in height, luxuriance, and fertility. In the early autumn most of the pots wore bedded out in the open ground; and this always injures plants which have been long kept in a warm greenhouse. All throe lots consequently suffered greatly, but tho Chelseacrossed plantR much less than tho other two lots. On the 3rd of October the Chelsea-crossed plants began to flower again, and continued to do so for some time; whilst not a single flower was produced by the plants of the other two lots, the stems of which were cut almost down to the ground and seemed half dead. Early in December there was a sharp frost, and the stems of Chelsea-crossed were now cut down; but on the 23rd of December they began to shoot up again from the roots, whilst all the plants of the other two lots were quite dead. Although several of the self-fertilised seeds, from which the plants in tho right-hand column in Table XX. were raised, germinated (and were of course rejected) before any of those of the other two lots, yet in only one of the ten pots did a selffertilised plant :Bower before the Chelsea-crossed or tho intercrossed pla:pts growing in the same pots. The plants of those two latter lots flowered at the same time, though the Chelseacrossed grew so much taller and more vigorously than the in tercrossed. As already stated, the flowers of the plants originally raised from the Chelsea seeds wore yellow; and it deserves notice that every one of the twenty-eight seedlings raised from tho tall white variety fertilised, without being castrated, with pollen fl'om the Chelsea plants, produced yellow flowers; and this shows how prepotent this colour, which is the natural one of the species, is over the white colour. · The .Effects on the Offspr-ing of intercrossin,r; l~"lowe'i'S on the same Plant, instead of crossz'n,q distinct Indz'vz'duals.-In all the foregoing experiments the crossed plants were the product of a cross between distinct plants. I now selected a very vigorous plant in Table XX., raised by fertilising a plant of tho eighth self-fe1:tilised generation with pollen from the Chelsea stock. |
