Notes from Hubert Goodrich's lecture. Trinkaus continues his notes on 'Spawning periods from page 2', and adds notes on 'Characteristics of Unvertifilzed Fundulus Egg' and 'Fertilization'. The 'Characteristics of Unfertilized Fundulus Egg' includes a diagram of the egg and the egg membrane. The 'Fertilization' includes a diagram of the first cleavage
Notes from Hubert Goodrich's lecture. Trinkaus' notes on the timing and efficacy of fertilization in sea water (with charts)
Notes from Viktor Hamburger's lecture. Trinkaus begins his notes on "Experimental Embryology of the Annelida & Mollusca" with information on the cell lineage studies of E.B. Wilson
Notes from Donald Costello's lecture. Trinkaus creates another diagram of the anatomy of the crustacean embryo, then begins a section on research on the "Barnacle" (with diagram)
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)
Notes from William Ballard's lecture. Trinkaus continues his notes from page 38 and 39 on gastrulation in Coelenterates. Starts a new section on development of Coelenterates following gastrulation, including diagrams
Notes from Viktor Hamburger's lecture. Trinkaus continues his notes on the Longfin short squid (Loligo pealeii) from page 44, with information covering egg-laying, fertilization, and cleavage. Diagrams of sperm penetration and polar bodies are included
Notes from Eliot Clark's lecture. Trinkaus begins his notes with information on "Microscopic observation of certain embryological Processes in the living adult mammal." concerning the circulatory system
Notes from Hubert Goodrich's lecture. Final page of notes from June 20, 1939 lecture, including 'Diff. between two species of Fundulus". Start of notes from Hubert Goodrich's lecture on June 21, 1939, including 'Promorphology of the egg'
Notes from William Ballard's lecture. Trinkaus takes notes on reproduction in Coelenterates
Notes from Oscar Schotte's lecture. Trinkaus continues notes from page 86 on the metamorphosis of echinoderms with five more diagrams (labeled 3-7).
Notes from O. Schotte's lecture. Trinkaus continues his list from the previous page with "Factors of Differentiation, Potencies" that includes information on transplantation in planaria (includes three diagrams) and notes on the works of Guyenot, Weiss and de Georgi