Fialkow, Philip J Correspondence about children with Down's syndrome, and the frequency of seropositivity in older mothers with graphical representations of the distributions and expectation tables based on age, with typescript of article for The Lancet reporting the findings. Also includes a revised copy of the same article which was refused due to lack of space. Letter dated 1967 confirming that the article will be published in Nature. Offprint of article on the same subject published in The Lancet in 1965. Nov-Dec 1965