Notes from Hubert Goodrich's lecture. Trinkaus makes notes on the 'Origin of the Cells of the Blood Vascular System', including the 'Monophyletic theory of origin of blood cells' and 'Polyphyletic theory', with special reference to Stockard on Fundulus. Stockard recognized three different types of cells (with diagram): '1. endothelial living cells of blood vessels'Lecturer: H.B. Goodrich, Lecture "Teleost Embryology. Special topics in Organogeny." (Information taken from the 1939 Embryology Course Book)Page 20 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