You are welcome to use this as long as you wish. If you think it has any permanent value to you, keep it. Otherwise we would
appreciate its eventual return since we could get so few from the publisher.
Van mentioned that you had some pertinent questions about our work. We would welcome any comments
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that you may have. We often wish we could handle carcinogenesis with the facility that you have shown in your brilliant work.
The complexity of the reactions and the time factor involved have made it difficult for us, at least, to devise meaningful
experiments in our field.
We have also enclosed another reprint with our latest data on the fluoro dyes