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Show NTHUS CARYOPHYLI_JUS. CHAP. IV. 138 DIA . l two kinds of seeds germinated at the divisions; but when on Y ted on the opposite sides of other pots; same ti.m e. , t.h eay· were plan k aces in one of the three columns and th1s IS m wa t ed by bl.a n h spt ble signifies that the sec dl'm g. ·n A Omtea . . . in Table XLV·t · mne asure d., and a + s1gn1fies that the plandt died before 1 was d therefore was not measure . fl wer-stem an . lf did not produc~ a 0 no less 'than eight out of the mghteen se - It deserves notwe t.bat died or did not flower; whereas only fertilised plants either . t crossed and four out of the twenty · three out ofth e ei·g hteen 1n er . " thJ'· s predicament. The self-d l nts were In London-crosse P a 'a decidedly less -vigorous appcara~ce fertilised plants had th two lots, their lea-ves bcmg than the plant~ of th~n oon~; one pot did a self-fertilised plant smaller and narrower. k' ds of crossed plants, between of the two In · flower before one k 1 d'ffi renee in the period of flowermg. which there was no mar edc tl tehe base of the calyx, after they h 1 t were measure o T e p an s . th late in the autumn. had completed th~Ir gro~ the sixteen London-crossed pla~ts in The average heigh~ 0 . 2 . l s. that of the fifteen mterthe preceding table. IS 3 2 . 8 ~~c ~at of the ten self-fertilised crossed plants, 28 Inches' a plants 26 ·55. · t · · So that in height we have the following ra ws .- The London-crossed to the ~elf-fertiliseda:s i~~ !~ ~~ The London-crossed to the Inte~c;ro. sed 100 to 95 The intercrossed to the self-fertilised as h. ch it should be remembered rrhese three lots of plants, W I'd f plants of the third d · d tl e mother-s1 e rom were all enve on . 1 . . d . three different ways, were self-fertilised genera~I?n, fe:tihs~ Ill d their flowers were freely left exposed to the VISits of In$ec s, a~ h lot became ripe they crossed by them. As the capsules.~ c:~pty or bad ones being were gathered and kept s.eparate, t. ~dlc of October, when the thrown away. But towards. the m~l . gathered and were capsules could no longer npen, a wcr~ ere then crushed, counted, whether good or bad. The cap~uhc~ w For the sake of and the seed cleaned by sieves and wmg 1 8 t: n as if there had uniformity the results are gi vcn from calcu a 10 ' " been twenty plants in each lot. actually produced 286 The sixteen London-crossed plants ld have IJroduced capsules; therefore t wen t y sueh plants w.o hu t of the seeds, th o 357. 5 capsules ; and from the actual we:g 'ght of seeds. twenty plants would ha-ve y1.e ld0 d 4.62 grains wo1 CHAP. IV. COLOUR OF THE FLOWERS. 139 The fifteen intercrossed plants actually produced 157 capsules; therefore twenty of them would have produced 209 · 3 capsules, and the seeds would have weighed 208 · 41) grains. The ten self-fertilised plants actually produced 70 capsules; therefore twenty of them would have produced 140 capsules; and the seeds would have weighed 153 · 2 grains. From these data we get the following ratios:- Number of capsules produced by an equal number of plants of the three lots. Number of Capsules. The London-crossed to the self-fertilised, as 100 to 39 The London-crossed to the intercrossed, as 100 to 45 The intercrossed to the self-fertilised, as 100 to 67 Weight qf seeds produced by an efj_U:tl number of plants of the three lots. Weight of Seed. The London-crossed to the self- fertilised, as 100 to 33 The London-crossed to the· intercrossed, as 100 to 45 The intercrossed to the self-fertilised, as 100 to 73 We thus see how greatly the offspring from the self-fertilised plants of the third generation crossed by a fresh stock, had their fertility increased, whether tested by the number of capsules produced or by the weight of the contained seeds; this latter being the more trustworthy method. E-ven the offspring from the self-fertilised plants crossed by one of the crossed plants of the same stock, notwithstanding that both lots had been long subjected to the same conditions, had their fertility considerably increased, as tested by the same two methods. In conclusion it may be well to repeat in reference to the fertility of these three lots of plants, that their flowers were left freely e:x:posed to tho visits of insects and were undoubtedly crossed by them, as may be inferred from the large numbm· of good capsules produced. 'l1hese plants were all the offspring of the same mother-plants, and the strongly marked difference in their fertility must be attributed to the nature of the pollen employed in fertilising their parents ; and the difference in the nature of the pollen must be attributed to the different treatment to which the pollen-bearing parents had been subjected during several previous generatim.is. Colour o/the Flowers.-The flowers produced by the self-fertilised |
