Physico-theology — Story, Setting & Ideas

Mechanical Design in Animal Anatomy

Derham devotes considerable attention to the physical structures of animals, treating them as instances of 'Nature’s Mechanism.' In a note on the opossum, he quotes Dr. Tyson’s description of the 'Spines, or Hooks' on the underside of the tail vertebrae, which allow the animal to hang from boughs with 'but little labour of the Muscles required.' Derham marvels that 'nothing, I think, could be more advantagiously contrived' for this purpose. Similarly, he notes the opossum's abdominal pouch, supported by 'two Bones (not to be met with in any other Skeleton) and four Pair of Muscles.' These observations are not merely descriptive; they serve as evidence for a designed universe. Derham’s method is to isolate a functional problem—climbing, carrying young—and then show how the animal’s anatomy solves it with apparent foresight. The tone is one of wonder at the ingenuity of the Creator, but the argument is grounded in specific, often technical, anatomical details.

Instinct and Parental Care as Providential Signs

Derham extends his argument from anatomy to behavior, particularly the instinctual care of offspring. He cites Cicero’s observation that birds 'quietum requirunt ad pariendum locum' and build nests 'quam possunt mollissimè substernunt' to protect their eggs. But Derham goes further, collecting examples of what he calls 'conjugal Στοργὴ'—natural affection. He recounts how aged female parrots would not eat unless the male first softened the food in his beak, 'quasi coctum.' He also notes that even timid animals, such as hens and partridges, will expose themselves to danger for their young: partridges 'drop frequently down' to distract predators. These behaviors, Derham implies, cannot be explained by mere mechanism; they point to a benevolent designer who instilled such instincts. The argument here is less about physical structure and more about the apparent purposefulness of animal actions, a theme that recurs throughout the lectures.

Classical and Contemporary Sources in Tension

Derham’s citations reveal a tension between ancient authority and modern empirical observation. He frequently invokes Cicero’s De Natura Deorum and Pliny’s Natural History, alongside recent works like Dr. Tyson’s anatomy of the opossum (published in the Philosophical Transactions) and John Ray’s Synopsis Methodica Avium. For instance, he follows a quotation from Cicero on bird nesting with a note from Pliny on rats supporting their aged parents, then adds a modern account of the 'little green Æthiopian Parrot' from Clusius via Ray. The juxtaposition is not merely decorative; it suggests that ancient wisdom and modern science converge on the same conclusion. Yet Derham does not always reconcile them smoothly. The classical authors provide moral and rhetorical weight, while the contemporary naturalists supply the precise anatomical data that Derham values as a Fellow of the Royal Society. This dual allegiance shapes the book’s argumentative style.

Readers approaching Physico-theology should attend to the interplay between its two registers: the homiletic frame of the Boyle Lectures and the empirical detail drawn from natural history. Derham’s notes, often longer than the sermon text, contain the most striking observations. The book rewards those who read with an eye for the specific—the hook-like spines of the opossum’s tail, the feeding behavior of parrots—rather than for the overarching theological argument alone.

I found myself thinking of Derham’s careful opossums and their stubborn tails, how he watched them with such patient awe. It reminded me, strangely, of Coleridge’s quieter reverence—that same unhurried attention, but turned inward. Both men saw a kind of order, one in tendons, the other in the tangled workings of belief itself. Aids to Reflection; and, The Confessions of an Inquiring Spirit — Inside the Classic felt like a different shade of that same old wonder.