10th June, 1955.
Dear Jim,
Many thanks for your letter, which I ought to have answered sooner.  I have now had from Casper a lot more details about his work, and I look forward to discussing it and other TMV problems with you soon.
I recently collected some repolymerised A-proteins from Schramm.  From this I have now obtained an X-ray diagram which is almost indistinguishable from a good TMV diagram except on the meridian and equator.  That is, the non-meridional, non-equatorial part of the TMV diagram must be due almost exclusively to protein.  I mention this because of your remark that the RNA must fit the TMV helical grid.  This may well be true, on the other hand I think, as far as the X-ray data are concerned, a disordered RNA core would fit in the picture equally well.
I shall probably be sending you a short paper in a few days.
Best wishes,
Yours