Meanwhile, he was studying precognitive dreams which he believed he and others had experienced. By 1927 he had evolved the theory of serial time for which he would become famous and published an account of it, together with his dream researches, in his next book "An Experiment with Time". In 1932 the Society for Psychical Research (SPR) tried to replicate his experimental results on dream precognition, but their investigator Theodore Besterman failed amid some controversy. The SPR's journal editor even prefaced his report with a disclaimer distancing the Society from his findings and Dunne gave his own version two years later in a new edition of his book.