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This provocative work by Dr. Harris deals with the thesis that birth-order, in the case of sons, plays a fundamental, formative role in a person's basic psychology. The author feels that first-born sons tend to have an intense relationship with the parents, resulting in early demands for maturity. The term that Dr. Harris uses is "connectedness-prone," meaning that they will be skilled in synthetic thinking activities. Later sons will have a different relationship with parents, not as intense, with other influencing factors, and these he describes as "disconnectedness-prone." They will tend to see things in analytic-type terms.
In establishing this basic idea, the author studied, roughly, 1,000 eminent men, gathering material from reliable sources. He states the general aim to be "to offer enough evidence, direct and circumstancial, so the burden of proof would be as much on those who contested as on those who affirmed the validity of
Sorum WR. The Promised Seed.. Arch Gen Psychiatry. 1965;13(2):189-190. doi:10.1001/archpsyc.1965.01730020091012