“Would you, gentlemen, enter into a contract to buy material from a concern, the excellence of whose product you had grave reason to doubt? Would you place orders to the extent of three and one half millions of dollars a year, waive inspection of material, accept whatever was offered you, and make no effort to get your money’s worth? You would not—not if you expected to hold your job. And yet, that is what you are doing with respect to the public education system of California. In 1916 the railroads of this state paid in operative taxes $7,151,583. Of this sum 51 per cent., or $3,647,300, was used for purposes of public education. “_The boys and girls sent you from the public schools you take into your service, sometimes after a perfunctory mental examination, generally with none_; in other words, _you waive inspection_, and then complain of the character of material after it has reached you and been paid for.” It is, of course, in the case of the untried beginner in business or industrial life, the boy or girl fresh from school who has as yet had no opportunity to discover or to demonstrate his or her ability or capacity, that the application of scientific mental tests is most essential. The skilled worker of long experience, master of his craft or of one or another of the specialized mechanical operations that enter so largely into modern industrial processes, has already found a definite place in the scheme of things and a simple trade or performance test is all that is required to indicate where that place is. For the present, at least, we are concerned with the worker of this class only long enough to point out, in passing, that a generally adopted scheme of intelligence measurement might have disclosed the possession by any individual of this group of abilities that would have given him a broader field and a happier and more useful existence, had he and those responsible for giving him a start in life been made aware of them early enough. Even to-day, when he has been engaged in his narrowly limited field of work for the better part of his active working life, he may have latent or undeveloped mental capacity such as would qualify him for more important, better-paid employment were some means provided for disclosing its existence.