This is a collection of occasional writings by Bion, covering a period between 1958 and 1979, which delve into a wide range of material - psychoanalysis, science, mathematics and logic, literature and semantics.

Cogitations, the last of the posthumous publications, is a collection of occasional writings representing Bion's attempts to clarify and evaluate both his own ideas and those of others by casting them in written form and frequently addressing them to an imaginary audience. Covering a period between February 1958 and April 1979, Cogitations