25 years ago: Ewald birthday issue

Twenty-five years ago the Jan. Issue of Acta Cryst. was dedicated to P. P. Ewald in honor of his 80th birthday. That issue included the articles, "On the Rigid-Body Motion of Molecules In Crystals," by Schomaker and Trueblood, "The Crystal Structure of the Alkaloid Reserpine," by Karle and Karle, and ''The Crystal Structure of Vitamin C," by Jan Hvoslef. The above illustration is taken from the latter.