Notes from Oscar Schotte's lecture. Trinkaus concludes the outline that he started on page 100 with notes on "1. Equatorial eggs" (with diagrams) and "2. Subequatorial eggs". Trinkaus then begins notes on Runstrom's "Double Gradient Theory" (with a diagram)Lecturer: O. Schotte, Lecture "Experimental embryology of Echinoderms I" (Information taken from the 1939 Embryology Course Book)Page 102 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