G E Allen Biology Wash Univ., St L. Lindegren and Morgan A small point: (I should have thought of you even sooner as an authoritative resource.) Herschel Roman has questioned whether my attribution about Lindegren is correct. My documentation is incomplete but I believe I recall Lindegren having spoken very positively about Morgan's encouragement. What do you think? Have you seen any records bearing on this? Sincerely, Joshua Lederberg