This 1982 Philadelphia study compared suicide(212 people;mean age 41.4),homicide(353;mean age 33.9) and natural death (207;mean age 59.6) victims. Date of death & birth was noted & place of death in the biorythm cycle was calculated for each victim. None of the suicidal, homicidal or natural deaths differed from chance expectations over the biorythm cycle(physical, emotional & intellectual cycles, of 23, 28 & 33 days respectively). The study failed to find any value in the biorythm theory.