Photographs

Notes from Oscar Schotte's lecture. Trinkaus draws 6 diagrams of fertilization and the first cell division.

Notes from Oscar Schotte's lecture. Trinkaus continues his notes on the echinoderm egg with the determination that "Therefore this determining subst. is located in something other than pigment." He creates four categories for his notes on this page: 'Micropyles', 'Position of the Germinal Vessicle', 'Polar Bodies', and 'Fixation of Oocytes on the walls of the Ovary'

Notes from Oscar Schotte's lecture. Trinkaus continues his notes on the echinoderm egg notes about the position of the first cleavage relative to the axis of the embryo. He offers results of various researcher's studies and concludes that "Vital staining method shows therefore that there is no coincidence of the 1st cleavage with the axis of the embryo"

Notes from Oscar Schotte's lecture. Trinkaus continues his notes on normal development of the echinoderm egg from the previous page with 3 labeled diagrams

Notes from Oscar Schotte's lecture. Trinkaus continues his notes from the previous page on the cleavage of the sea urchin embryo with information about the 5th (with diagram) and 6th stages of cleavage

Notes from Hubert Goodrich's lecture. Trinkaus continues cleavage notes from page 7. Begins a new section on 'Periblast'

Notes from Charles Packard's morning lecture, "Topics from the history of embryology". Trinkaus takes notes on the history of embryology beginning with Aristotle and William Harvey

Notes from Charles Packard's lecture. Trinkaus continues his notes from Packard's morning lecture on the history of embryology (begin page 81) with information on Swammerdam, Malebranche, Bonnet, Leeuwenhoek, and Spallanzani

Notes from Charles Packard's lecture. Trinkaus concludes his notes from Packard's morning lecture on the history of embryology (begin page 81) with some final thoughts from C.O. Whitman about epigenesis, heredity, and development, ending with the quote, "Facts without theory is chaos."

Notes from Oscar Schotte's lecture. Trinkaus continues notes from page 86 on the metamorphosis of echinoderms with general notes on rudimentary formation. Includes two diagrams (labeled 1 and 2).

Notes from Oscar Schotte's lecture. Trinkaus concludes notes from page 86 on the metamorphosis of echinoderms with a single line.