Notes from Viktor Hamburger's lecture. Trinkaus continues his notes on Hans Spemann and Historical Background from page 51-53 with discussion of Spemann's transplantation experiments on the crested newt (T. cristatus) and the smooth newt (T. taeniatus)Lecturer: V. Hamburger, Lecture "Determination and organizer action in Amphibian development." (Information taken from the 1939 Embryology Course Book)Page 54 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