'Despite the distinction and variety of his scientific achievements, only those personally acquainted with him can fully appreciate the causes of that profound respect with which he was regarded. Medicine, Magic and Religion is a document of first-rate importance ... and it will thus remain as a worthy monument to its distinguished author.' - Times Literary Supplement'I should like to meet Rivers in "the next world". It is difficult to believe that such a man as he could be extinguished. - Siegfried Sassoon