[In "The Philosophy of Hans Reichenbach" (above), I remarked upon the fertility of his posthumous work, The Direction of Time, especially its fourth chapter, which deals with the causal and statistical relations among macrophenomena. I emphasized the value of his ideas in connection with the explication of scientific explanation — in particular, their potential utility for purposes of developing a full-blown theory of causal explanation. Since that article was written, I have been devoting considerable attention to just such issues, and I feel that my hopes have been —at least to some extent — vindicated.