. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. INHERITANCE IN PURE LINES 377 4-000. .,75,000 2000 _ in the two species. Hence a comparison of variation in two cases, where the modes are dissimilar, can only be made by taking such dissimilarity into consideration, a comparison of the curves alone being misleading. The position of the mode can often be to some extent changed by modifying the environ- mental conditions, although the range of variation remains practically unaltered. It appears that individual variations are not inherited, and that in a pure l
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. INHERITANCE IN PURE LINES 377 4-000. .,75,000 2000 _ in the two species. Hence a comparison of variation in two cases, where the modes are dissimilar, can only be made by taking such dissimilarity into consideration, a comparison of the curves alone being misleading. The position of the mode can often be to some extent changed by modifying the environ- mental conditions, although the range of variation remains practically unaltered. It appears that individual variations are not inherited, and that in a pure line of descent the average of the race is main- tained. ^ This has been established by sowing seeds from a single individual of pure descent which has been self-ferti- lised, the seed pro- duced by the result- ing plants (likewise self-fertilised) being sown in separate groups, and the same procedure followed for several successive generations. It was thus found that the average size of in- dividuals derived from small parents is practically identical with that of individuals growai from tall parents; also that heavy seeds do not beget heavier-seeded offspring than those derived from light seeds. The following data, which serve. J 4 56 7 5^10 Perianth se&? (HlMEMOlME) G. U. YULE Fig 10 \5 20 RPvYS OF STIG^AR (PnPRVEFk) 2 20.—Variation curves, symmetrical oa the left and asymmetrical on the right. ' By a pure line is understood a pure-bred strain produced by self- fertilisation from a single Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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