The short Heroic age o£ Physics that started in 1925 was one of rare occasions when deep considerations o£ philosophy found application in carrying out physical calculations. In many parts of microphysics the calculations have now become relatively straightforward even if not easy, but most physicists seem to agree that some difficulties of philosophical principle remain to be resolved. This situation has produced a great effect on the way people think and write about quantum mechanics, a sort of gingerly approach to the fundamentals and a tendency to emphasize what 50 years ago was new the new theory at the expense of continuity with what had come before it.