“Darwin, although not the first to advance the theory of evolution, was the first to enlarge and further it. His deductions rest on three main theories—heredity, variation and natural selection. He thought that the offspring always inherited the parents’ qualities with something new in its composition. By natural selection Darwin meant the survival of the fittest, that is, that only the most fitted for life should live. In this way the offspring receiving traits from its parents, if they be to its advantage, will live and continue them, and those who have not got them will be killed. In other words, Darwin believed that the terrible struggle for existence, which usually destroys nine-tenths of each generation, must favor those who possess the best variation for their environment; and that these will in turn hand on to their successors these favoring variations. In this next generation the same process will be repeated, and in this way we get a steady though very gradual advance. “To-day, however, looking at it broadly, we can see that all heredity and variation need is some way of separating those individuals having some peculiar variation from those who do not possess any. This we call isolation, and it can easily be seen that natural selection is only a subhead under this title. Another form of isolation beside natural selection is geographical. “Our theories have advanced to this stage, and although it is quite a large move from the original ideas of Darwin, there are many questions still puzzling us, which have yet to be solved.” Then came Marian’s paper: