Mercer, D Letters between D Mercer, Medical Registrar at St. Martin's Hospital, and Penrose regarding analysis of the palm and foot prints for a Down's syndrome patient. Mercer also agrees to take a skin biopsy for analysis at the Galton Laboratory. Encloses rough and printed notes on the chromosomal analysis from skin culture, a family pedigree, karyograms, drawings of the dermal ridge main lines, and dermatoglyphic reports. Mar 1963 - Jan 1964