Notes from Oscar Schotte's lecture. Trinkaus begins his notes on 'Experimental embryology of the Echinoderms" with historical background from Hans Driesch (with diagram), Boveri, and HorstadiusLecturer: O. Schotte, Lecture "Experimental embryology of Echinoderms I" (Information taken from the 1939 Embryology Course Book)Page 99 of 113 from the first notebook of lecture and laboratory notes that John P. Trinkaus took during his time as a student in the Marine Biological Laboratory Embryology Course in 1939 in Woods Hole, MA