14th September, 1955
Dear Robley,
Many thanks for your letter a manuscript, which arrived while I was away on holiday.  I had heard quite a lot about the reconstituted virus, from various sources, and I'm very glad to have the details from you.  I should certainly like to look at its X-ray diagram.  The equator is completely different for polymerized A and for TMV, so it should be possible to get an idea of how much of the reconstituted has RNA down the middle.
If it is reasonably easy to orientate, a pellet containing 3 - 4 mg of material would be enough to work with.  The actual specimen used is, of course, a lot smaller than this, but it is usually necessary to try a good many times before getting satisfactory alignment.
I am glad to see you are coming over for the CIBA conference next spring.
Yours sincerely,
Rosalind Franklin