Letter | Published:

Statistical Aspect of the Production of Primary Lesions by Plant Viruses

Abstract

MR. BALD points out in NATURE of June 15 (p. 996) that an attempt to fit the equation y = N(1 eax) to data obtained by Samuel and Bald1 meets with poor success, especially at high dilutions. Samuel and Bald plotted the logarithms of their counts against the logarithms of the dilutions and found that at high dilutions the points lay on a straight line with a slope of 0.6. It may be easily shown that the equation predicts a slope of unity. Data published recently by Price2, Chester3, Caldwell4 and Beale5, give experimental curves with approximately unit slope. This suggests that the discrepancies between Samuel and Bald's experimental counts and values calculated from the equation may in a large part be due to the fact that their data are at variance with other measurements in the literature.

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References

  1. 1

    Ann. App. Biol., 20, 70–99 ; 1933.

  2. 2

    Contrib. Boyce Thompson Inst., 4, 359–403 ; 1932.

  3. 3

    Phytopath., 24, 1180–1202 ; 1934.

  4. 4

    Ann. App. Biol., 20, 100–116 ; 1933.

  5. 5

    Contrib. Boyce Thompson Inst., 7, 37–53 ; 1935.

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