As the unit characteristics are certainly not so closely allied to our social needs as “mechanical intelligence” and “social intelligence” or even “rote memory for numbers,” we may not even distinguish presence of any five hundred elements from presence of any other five hundred elements in terms of what we now measure as intelligence. It is just as likely that all the elements of intelligence are necessary for every vocation and that all contribute to success of any one kind as it is likely that some are necessary for one vocation and others for another. This is a question of more or less. I believe that the amount to which a person’s specific talents, his vocation as distinct from his general power, are shaped by the combinations of elements which make up his inheritance, is much less than believed by Francis Galton, who says: “There cannot then remain a doubt but that the peculiar type of ability that is necessary to a judge is often transmitted by descent.” And again: “In other words, the combination of high intellectual gifts, tact in dealing with men, power of expression in debate, and ability to endure exceedingly hard work, is hereditary.”[19] I believe that the amount of influence which inheritance has upon the _kind_ of thing a man does in life has been overestimated; that the inherited factors influence more the _way_ in which he shall do whatever the environment influences him to do. This leaves plenty of play for the close correlation between parents and children in both intelligence and vocation. The former is the result of inheritance, the latter is the result of environment. All competent psychologists would agree to-day to less specific inheritance than a basis, for instance, for the distinction in vocation of minister and orator; and more specific inheritance than for such a statement as “We inherit how well we will do, we learn what we will do.” There would be substantial agreement to the statement that the inherited nervous bases of a very intelligent plumber are more like those of a very intelligent statesman than like those of a stupid plumber. This question is, _how much_ inheritance we can conceive of as being made up of neuro-chemical elements determining us to do one kind of a thing rather than another.