This selection of clinical seminars held by Wilfred Bion in Brasilia (1975) and Sao Paulo (1978) is the nearest we shall ever get to experiencing his application of his theories and views to consulting-room practice. It is also likely to be the only printed record of this area of his work. As those who underwent analysis with Bion will testify, nothing can approach the experience of the thing itself, but, failing that, these seminars may help to fill the gap now that his voice can only be heard through his published writings and lectures.