Notes from Viktor Hamburger's lecture. Trinkaus continues his notes from the previous page on the work of Novikoff, and starts a new section on Horstadius (with three diagrams)Lecturer: V. Hamburger, Lecture "Experimental Embryology of Annelida and Mollusca" (Information taken from the 1939 Embryology Course Book)Page 38 of 72 from the second 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