16 JANUARY 1926, Page 23

Mr. J. W. Sullivan is well known as a popularizer

of modern • mathematical- philosophy: - He undertakes a huge task in Three Men. Discuss IlelatitritY. (Collins). Time and time again we have. had works upon the Einstein theory in which, the general reader was assured- that he would be -at ease ; that -no special mathematical knowledge was needed. And: almost always the general reader was astonished to find that

his mathematics were quite inadequate for more than the first page or two. The assurances upon the cover of Mr. Sullivan's book, however, are so definite and confident that We entertain new hopes.