Addenda to "Memorandum on Gene Mutation in Man" Two typescript copies and one manuscript copy of a note amplifying the third paragraph, page 1, of Penrose's "Memorandum on Gene Mutation in Man", for the Panel on Genetic Effects, paper references MRC. 55/396, and CNR. 55/8. Also includes typescript and manuscript copies of a table and references, along with cover note, to be sent to J B S Haldane and H Harris. 1955