Correspondence, with related papers, mostly regarding research on cephalosporins. Included at C.653-C.659 are manuscript and typescript drafts, some incomplete and disarranged (with proof at C.661), of a paper entitled 'Cephalosporin C' by Abraham and P.B. Loder in Cephalosporins and Penicillins: Chemistry and Biology, ed. by E.H. Flynn, New York 1972. Related correspondence is at C.649-652 and C.660-C.662.