1955

1955 is cited as the year of a paper by J. B. S. Haldane that anticipated an evolutionary explanation for rescuing close relatives from drowning. The reference crystallizes a central distinction in the book: behavior can have consequences that favor genes without the animal consciously calculating those consequences.

Haldane’s Example

The book invokes Haldane while considering how relatedness and the risks and benefits of helping might affect the evolution of altruistic behavior. Haldane had postulated that a gene for saving close relatives from drowning could spread. The example makes kinship part of the evolutionary calculation: a costly act can, under the relevant conditions, preserve copies of a gene in relatives.

Calculation Without Conscious Arithmetic

The argument raises an apparent difficulty: a survival machine could not be expected to perform a complicated calculation about relatedness and risk in the urgency of a rescue. Haldane’s own reported experience sharpens the point. He said that when he had pulled people who might be drowning from the water on two occasions, he had faced only an infinitesimal risk and had no time to do the sums.

The book does not treat this absence of conscious arithmetic as evidence against an evolutionary account. Instead, it distinguishes an animal’s immediate decision from the longer process by which genes influencing behavior become common. A survival machine may be predisposed to act in ways that function as if a calculation had been made; the calculation is an explanatory model of the behavior’s evolutionary conditions, not necessarily a thought occurring in the rescuer’s mind.

Place in the Argument

The 1955 reference supports the book’s broader treatment of kin altruism and relatedness. It links an abstract account of gene-level costs and benefits to a vivid case of rescue, while preserving the difference between observable action and its proposed evolutionary explanation. In that sense, the date marks an intellectual anticipation, not a claim that rescuers consciously serve their genes or that the biological account prescribes how people ought to behave.