The question for man most momentous of all is whether or no he has an immortal soul; or—to avoid the word immortal, which belongs to the realm of infinities—whether or no his personality involves any element which can survive bodily death. In this direction have always lain the gravest fears, the farthest-reaching hopes, which could either oppress or stimulate mortal minds. On the other hand, the method which our race has found most effective in acquiring knowledge is by this time familiar to all men. It is the method of modern Science—