. Contributions from the Laboratory of Plant Genetics. 22 THE AMERICAN NATURALIST [Vol. XLVIII lowed, and unless one considers that the results of 1912 are somewhat too high (probably a valid assumption), the change has increased instead of decreased. Naturally there must be a decreased momentum in change of mean time, but this decrease is not yet shown by the Fig. 4. Plant of Halladay Ha- Fig. 5. Plant of Halladay Ha- vana Tobacco (19-2)-l-2, which Av- vana Tobacco (19-1)-1-1, which Av- erages 30 Leaves Per Plant. It erages Leaves Per Plant. Three is the Result of Three Years o
. Contributions from the Laboratory of Plant Genetics. 22 THE AMERICAN NATURALIST [Vol. XLVIII lowed, and unless one considers that the results of 1912 are somewhat too high (probably a valid assumption), the change has increased instead of decreased. Naturally there must be a decreased momentum in change of mean time, but this decrease is not yet shown by the Fig. 4. Plant of Halladay Ha- Fig. 5. Plant of Halladay Ha- vana Tobacco (19-2)-l-2, which Av- vana Tobacco (19-1)-1-1, which Av- erages 30 Leaves Per Plant. It erages Leaves Per Plant. Three is the Result of Three Years of Se- Years of Selection for Low Leaf lection for High Leaf Number is Number Have Proved Unsuccessful. Family 19, which in 1909 Averaged New Haven, 1912. Leaves Per Plant. New Haven, 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 Bussey Institution. Boston : [s. n. ]
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