Letter | Published:

Unit Cell Measurements of Wet and Dry Crystalline Turnip Yellow Mosaic Virus

Nature volume 162, pages 139140 (24 July 1948) | Download Citation



CBYSTALS of turnip yellow mosaic virus, kindly sent to us by Dr. Kenneth Smith and Dr. Roy Markham (see Nature, July 17, p. 88), were examined both optically and by X-ray diffraction in this Laboratory. The crystals were small, isotropic, less than 0·1 mm. in size and ill-formed, but just sufficiently developed to indicate that they were octahedral bipyramids. The smaller crystals, first observed by Smith and Markham under a 1/12 oil immersion lens1, are better formed and display a better development of this form. Following Federov‘s law on the relation between lattice development and crystal form, these crystals should possess a face-centred lattice.

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  1. 1.

    , and , Nature, 157, 300 (1946).

  2. 2.

    , , and , Nature, 162, 88 (1948).

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    , and , J. Gen. Physiol., 25, 111 (1941).

  4. 4.

    , , and , Proc. Roy. Soc., A., 191, 83 (1947).

  5. 5.

    Unpublished data.

  6. 6.

    , and , Nature, 161, 250 (1948).

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  1. Birkbeck College Research Laboratory, 21–22 Torrington Square, London, W.C. I. July 9.

    • J. D. BERNAL
    •  & C. H. CARLISLE


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