Reviews of the original publication:’Mr Cohen's book is a welcome addition to the study of the concept of inductive support of hypotheses, that treats it as explicable in terms of induction by variation of circumstances - the book follows in the tradition of Bacon, Whewell, Herschel and Mill.’ Brian Carr, Philosophy 'This is a book which will prove extremely interesting to phiIosophers concerned with the many problems surrounding the concept of experimental support.’ Simon Blackburn, British Journal of the Philosophy of Science’Cohen's book . . . is an original and provocative work, which will certainly lead to considerable philosophical controversy.’ R. G. Swinburne, Philosophical Books ’This is an original and substantial work that makes a major contribution to its subject.’ The Times Literary Supplement