Jessica Riskin on Jean-Baptiste Lamarck and Life as Creative Agency | Mindscape 348

Early modern European thought, influenced by automata and clockwork, often modeled living beings as passive, designed machines. René Descartes was a key proponent, viewing animal bodies as complex mechanisms. This 'passive mechanism' tradition, later adapted by figures like William Paley, used the apparent design in nature to argue for a divine creator. In contrast, Lamarck and other 'active mechanists' proposed that organisms are intrinsically self-making and self-transforming, gradually developing and adapting through internal processes over vast periods.

Descartes' descriptions of hydraulic grottoes and his theories on living bodies as machinery (12:25). Paley's watchmaker analogy (21:22). Riskin's explanation of Lamarck's 'power of life' as an intrinsic, material force driving complexification and self-transformation (46:32).

Contrary to popular belief, Charles Darwin himself accepted and incorporated Lamarckian ideas, specifically the 'inheritance of acquired characteristics' (which he called 'inherited effects of use and disuse'). This concept, where an organism's behavioral changes or habits could be passed to offspring, was present in all editions of 'On the Origin of Species.' However, later neo-Darwinists, particularly figures like August Weismann, vehemently rejected Lamarckian inheritance, emphasizing the absolute passivity of the organism and the sole role of random genetic variation and natural selection.

Riskin states Darwin 'adopted Lamar's idea of what we now call the inheritance of acquired characteristics' and 'never questioned that. It's in every edition of the origin of species.' (26:30). Weismann's mouse tail-chopping experiments, intended to refute Lamarckism, are discussed as a 'gimmick' that did not truly address Lamarck's or Darwin's actual beliefs (30:25).

The rejection of Lamarckian ideas and the embrace of a purely passive organism model in neo-Darwinism were not solely based on scientific evidence but were deeply intertwined with political and ideological motives. Lamarck's theories were associated with radicalism and atheism during the French Revolution, making them politically undesirable. Later, in the 20th century, a reductive neo-Darwinist paradigm was attractive to eugenicists, who saw organisms (including humans) as passive vehicles of genes, allowing for the idea of 'managing' human evolution based on perceived genetic inequalities. This highlights how scientific 'simplicity' can sometimes mask a desire for power and control.

Lamarck's theories having an 'ill odor of radicalism and revolution, regicide, atheism' (28:46). Julian Huxley's declaration of 'modern synthesis' and his eugenic views, including coining 'transhumanism' and advocating for 'free but unequal' societies (1:03:08, 1:09:30). Francis Crick's casual suggestion of government-controlled sterilization (1:05:02).

Contemporary biological research is increasingly recognizing the active role of organisms in shaping their own evolution, echoing Lamarckian principles. Fields like epigenetics demonstrate how environmental factors can cause heritable changes in gene expression without altering DNA sequences. Niche construction theory shows how organisms modify their environment, which then exerts selective pressures back on them. Behavioral isolation, where populations stop interbreeding due to behavioral differences before genetic incompatibility, further illustrates how organismal actions can drive speciation. These developments suggest a more complex, dynamic interplay between organisms and their environment than the purely passive model allowed.

Discussion of epigenetic changes in giraffes (56:00). Peter and Rosemary Grant's work on Darwin's finches showing behavioral isolation preceding reproductive isolation (59:09). Martha Munoz's research on lizards adapting to cold by behavioral 'nimbleness' (1:00:00). Mark Feldman's work on niche construction (1:00:37).