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Show BRASSICA OLERACEA. CHAP. IV. 100 . d h d begun to form t h d grown much bulkier, _and a amarked superiority pland s Ta d w acquire . h · ·ht hea s. he crossed ha ndo average d 8. 02 inches I1n0 0 t0 1g 91' ' 'n general appearance, an d 7. 31 inches; or as 0 a' I h '1st the self-ferti·1 I· se d average. t of their pots and plante. ;h~ plants were then turned ~u By the 5th of August their undisturbed in the open gr?un ~ral had grown so crooked that heads were fully formed, but se-:neasured with accuracy. The ther. r l1 e1. g· hts could hardly bee on thew. h o1 e considerably tallhe r crossed plants, ~o:vever, we~e following year they.flowered; t e than the self-fertilised. In t th self-fertilised In three of the cr.o ssed plants flowaerrnien gt_i mbeef ~Irne Pote II. The flower-stems were pots, and at the :hown in Table XXIX. now measured, as TABLE XXIX. if Flower-stems; 0 s~.g n~J,·;~:e s that a Flower-stem JJ[easured to tops o ~ not formed. wa ... l - I No. of Pot. Crossed Plant!i. Sdf-fertiliscd Plants. - --1- 1- - Inches. Inches. I. 49i 44 39g 41 1- - I - 1- - II. 37g 38 33~ 3sa --- 1- - III. 47 51~ 40 41~ 42 46~ - -- - IV. 43~ 20~ 37 ~ 3 3 ~ 0 0 1- - ~- - Total in inches. 369•75 051•00 - I - . sed lants here average 41·0.8 The nine flower-stems on the crlofs.c t'lP _sed plants 39 inches m inches, and the nm· e on thte tshei s -s1emr aIllI difference, whJ·C h 'mo rets-hoio ·ht or as 100 to 95. Bu f the self-fertilised plan ove~· depended almost wholly on onte _o the least show the vast being' · only 20 m· e h es 1 · h does no m Both 11g ' th If-fertilised plants. t superion·t y of the cr·o s sed over ien sPe ot IV., win.c h dI' d no t lots, including the two pl~nts t tbe ground and weighed, bu flower, were now cut down c ose o I CHAP. IV. CROSS WITH A FRESH STOCK. 101 those in Pot ll. were excluded, for they had been accidentally injured by a fall during transplantation, and one was almost killed. The eight crossed plants weighed 219 ounces, whilst the eight self-fertilised plants weighed only 82 ounces, or as 100 to 37; gsor etaht.a t the superiority of the former over the latter in weight was The Effects if a Cros.• with '"fresh Stock.-Some flowers on a crossed plant of the last or second generation were fertilised, without being castrated, by pollen taken from a plant of the same variety, but not related to my plants, and brought ffom a nursery garden (whence my seeds originally came) having a different soil and aspect. The flowers on the self-fertilised plants of the last or second generation (Table XXIX.) were allowed to fertilise themselves spontaneously under a net, and yielded plenty of seeds. These latter and the crossed seeds, after germinating on sand, were planted in pairs on the opposite sides of six large pots, which were kept at first in a cool greenhouse. Early in January their heights were measured to the tips of their leaves. The thirteen crossed plants averaged 13 ·16 inches in height, and the twelve (for one had died) self-fertilised plants averaged 13 · 7 inches, or as 100 to 104; so that the self-fertilised plants exceeded by a little the crossed plants. TABLE XXX. Weight of Plants after they had formed I-Ieads. No. of Pot. Crossed Plants from Self-fertilised Plants Pollen of fresh Stock. of the Third Gene-ration. Ounces. I. 130 Ounces. 18~ II. 74 34~ III. 121 17f IV. 127~ 14 v. 90 llf VI. 106t 46 Total in ounces. 649·00 142. 2tj |
