Notes from Viktor Hamburger's lecture. Trinkaus continues his notes on the derivatives of the endoderm, and begins notes on the cell lineage of each of the germ layers (includes cell lineage diagram), with information on '1st quartette", "2nd Quartette" and "3rd Quartette"Lecturer: V. Hamburger, Lecture "Development of Annelida" (Information taken from the 1939 Embryology Course Book)Page 24 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