Harold Morowitz and D. Eric Smith (2007), Complexity 13(1):51–59 (September 2007; online 8 October 2007). First issued as Santa Fe Institute Working Paper 2006-08-029 (dated 7 August 2006), the version read.
The brief’s citation (Complexity 13(1):51–59, 2007) is correct. The brief offered either this paper or Morowitz’s Energy Flow in Biology (Academic Press, 1968). I chose the paper because the book could not be read: the Internet Archive holds four scans of it (1968 and 1979 printings), all lending-only, and no lawful copy was found. The book is not filed.
Key takeaways
- The thesis. “The continuous generation of sources of free energy by abiotic processes may have forced life into existence as a means to alleviate the buildup of free energy stresses.” If so, life “had to emerge on the earth”, and its early steps would recur on any similar planet.
- The analogy. Lightning and hurricanes are non-equilibrium channels that carry current (charge, heat) between reservoirs much faster than diffusion does. Metabolism is such a channel “in the chemical domain”.
- The evidence from metabolism. A universal anabolic core of fewer than 500 small molecules; the reductive citric-acid cycle at its root, which is network-autocatalytic for carbon from CO₂; a cascade from it to amino acids, sugars and fatty acids that “leaves no energetic waste products”. Read as a relaxation channel for redox and phosphate energy.
- The framework. Jaynes’s maximum entropy with entropies that depend on currents, which can predict that currents form. This is set against entropy-production principles, which “ultimately fail as general principles”. Positive feedback gives thresholds that are phase transitions “equivalent in all statistical respects to equilibrium phase transitions”.
- The “collapse to life”. The abiotic earth was metastable under continuous geochemical free-energy production; the emergence of life was its collapse to a more stable state, more like phase separation in an alloy than a new “state”. Major transitions (photosynthesis, endosymbiosis, multicellularity) are further, irreversible collapses.
- Metabolism first. Selective advantage came from interaction with metabolites before replication was coordinated, which the authors note is “directly opposite” to the RNA-world premise. Cells and individuality are “a by-product of cellular form”.
Standing in the record
Filed on 2026-10-02 at the owner’s request, as part of filling out the record’s coverage of the “life as dissipation” literature. No anthology topic holds it, and it carries no instruction for machine-learning practice.
NOTE-425 is the close reading of 2026-10-02, and it placed the work: Active. It is a programmatic essay. Its value is the specific picture of core metabolism as a geochemical channel and the explicit rejection of entropy-production principles in favour of Jaynesian entropy. It proves nothing new; the formal results it leans on are Smith’s earlier papers, which the record does not hold.
Where it bears on what the record holds:
- The demarcation question (LIT-192, NOTE-094). The paper’s aim is “an essential continuity between physics, chemistry, and biology”. Life is a lightning bolt “through the graph of geochemical reactions”. The only distinguishing feature it allows is that life’s chemical substrate has “a complex structure and informational richness exceeding that of other physical systems”. It draws no principled line, and it treats the individuality the demarcation debate turns on as a late by-product.
- Schrödinger (LIT-530, Deferred). Cited for the “paradox” that biomass has lower equilibrium entropy than its abiotic matter. The paper says the paradox comes from using equilibrium entropy on a driven earth.
- The rest of the batch. Like Schneider & Kay (LIT-533), it reads the biosphere as a channel for energy flow. Both reject extremum principles on entropy production, but they replace them differently: Schneider & Kay with a “restated second law” about gradients, this paper with Jaynesian entropy maximization over states that include currents. Both use the hurricane as the non-living analogue.
- Self-organization in the record. The reductive citric-acid cycle as a network-autocatalytic engine is the metabolic counterpart of the primitive catalytic cycles in LIT-036, which are self-organized spatially rather than chemically.
- “What Lives?” (LIT-211). Fits the “Dissipative Self-Organizing Systems” cluster (NOTE-109), with a metabolism-first emphasis.