Notes mostly in Abraham's hand; the remainder in an unidentified hand. Separated into sections by dividers labelled as follows: 'Alvein' (one page dated February 1949); 'Bacilysin' ([c. April]-May 1949); 'Ayfivin' (December 1948-November 1953); 'Pu[?m]ulin' (February 1951); 'Ageritin' (December 1952); 'Nisin' (June 1950-January 1952); 'Micrococcin' (October [?1951]-January 1952); 'Techniques' (pages dated September 1949, February-March 1950).