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Show 212 NICOTIANA TABACUM. CHAP. VI. TABLE LXXXVIII. Nicotiana tabacum. Plants raised f rom two Plants of the Third Self -fertilised Genera#on in Pots II. and V., in Table L XXX VI I. From Pot II., Table LXXXVII. From Pot V., Table LXXXVII. 1- ---...,.----------- 11-- --- I Plants of the Kew-crossed Fourth Self- No. of Pot. Plants. fertilised Gen- No. of Pot. 1 eration. Plants of the Kew-crossed Fourth Self· Phmts. fertili ~d Geu-eration. ----------------11-------- ---:----1 I. 84 ~ 68 ~ I. . 31 5 IncbPs. 77 ~ 7g lnches. .16 5~ Inches. I Inches. -----:-----------11----------- -- I i~~ I II. ·----t......:..- III. 78 ~ I 48 51 ~ 70 II. --------11------- 77 ~ I 77 g III. 1----·'--------- IV. 27 ~ 7 1--~rBo! 90~ I 22~ 11 ~ __r _v_. __ 4g' m ~-~~~ I _____ , ____ ____ , v. 89 17 I 85 I 5 ~ v. 94g I 28 ~ _!_I_._~-~ 80= VI. ~~-~-~ --~--~:! I i,~~ I VII. I ~5j 1 __ 6_1~- VIII. 83~ 7 2~ 27 s I 84 ~ II VIIl. I 65g I 78 ~ -T-oit_:_;h_ :_ :_} ,_ __9 _0_2_·6 -3-~~~ I To.talh in}~--7 43 ·13 ~~~ I me es. Some of the remaining seeds of both series, whether or not in a state of germination, were thickly sown on the opposite sides of two very large pots; and the six highest plants on each side of each pot were measured after they had grown to nearly their full height. But their heights were much loss than in the for~er trials, owing to their extre:n;:tely crowded condition. Even whilst quite young, the crossed seedlings manifestly had much broader and finer leaves than the self-fertilised seedlings. CROSS WITH A FRESH STOCK. 213 TABLE LXXXIX. Nicotiana tabacum. Plants of the same parentage as those in Table LXXXVIII., but grown extremely crowded in two large pots. From Pot II., Table LXXXVII_. _I From Pot V., Table LX XXVII. Kew-crossed : Plants of the Kew-crossed Plants of the Fourth Self-ferti- Fourth Srlf-ferti- Plants. lised Generation. Plants. Used Generation. ~---- Inches. InchPs. Inches. Inches. 42~ 22 ~ 44§ 22 ~ 34 19 ~ 42 ~ 21 30~ 14 ~ 27 ~ 18 23~ 16 3 1 ~ 15§ 26~ 1 3~ 32 1 3~ 18~ 16 2 4 ~ 14 ~ -- - 175•63 lo-1· 50 202•75 105•13 The twelve tallest crossed plants in the two pots belonging to the two series average here 31· 53, and the twelve tallest self-fertilised plants 17 · 21 inches in height; or as 100 to 54. The plants on both sides, when fully grown, some time after they had been measured, were cut down close to the ground and weighed. The twelve crossed plants weighed 21 · 25 ounces; and the twelve self-fertilised plants only 7 · 83 ounces; or in weight as 100 to 37. . The rest of the crossed and self-fertilised seeds from the two parent-plants (the same as in the last experiment) was sown on the 1st of July in four long parallel and separate rows in good soil in the open ground; so that the seedlings were not subjected to any mutual competition. The summer was wet and unfavourable for their growth. vVhilst the seedlings were very small the two crossed rows had a clear advantage over the two self-fertilised rows. When fully grown the twenty tallest crossed plants and the twenty tallest self-fertilised plants were selected and measured on the 11th of November to the extremities of their leaves, as shown in the following table (XC.). Of the twenty crossed plants, twelve had flowered; whilst of the twenty self-fertilised plants one alone had flowered. |
