The Structure and Habits of Spiders

In Short

This book serves as a foundational natural history of the spider, detailing how these creatures are built, how they feed, and—most significantly—how they construct their intricate silk traps. Drawing on the scientific observations of the late 19th century, it strips away the myths of "deadly poison" and "supernatural wisdom" to present a clear, biological portrait. Its enduring value lies in its patient, mechanical explanation of how spiders spin, hunt, and reproduce, offering a rewarding look at the quiet engineering that sustains life in the fields and homes around us.

The Story

The narrative begins by grounding the reader in anatomy, framing the spider as a remarkably specialized machine. Using the common round-web spider as a guide, the text maps out the divisions of the body, the function of the sucking-stomach, and the role of the nervous system. From here, the focus shifts to the act of feeding. The book dismantles the long-standing fear surrounding spider bites, noting through various experiments that these animals are not inherently aggressive; they are simply predators responding to mechanical stimuli.

Once the anatomy and diet are established, the book moves into its heart: the art of spinning. This section explores the variety of silken structures, from the simple tubes of the ground-dwelling Lycosa to the elaborate, hinged trap-door nests of the Mygalidæ. The author provides a detailed, step-by-step breakdown of how a spider constructs a web, explaining how they calculate the placement of radiating lines and sticky spirals. This process is not merely instinctual but shows a form of "feeling" and adjustment, where the spider tests the tension of her work with her own limbs.

The narrative then expands to the unique behaviors of different families. We learn about the "flying" spiders that use the wind to travel, the crab spiders that wait in ambush, and the jumping spiders that navigate with surprising agility. The text also touches upon the social and predatory interactions between species, including instances where one spider might hijack the web of another or when young spiders emerge from their cocoons to begin the cycle anew.

The final arc follows the lifecycle of the spider, from the laying of eggs and the construction of protective cocoons to the molting process. The author illustrates how the anatomy of male and female spiders shifts as they mature, particularly in the development of the palpal organs and the epigynum. By describing the growth of the embryo within the egg, the book brings the reader full circle, showing how a microscopic cluster of cells transforms into a fully functioning, eight-legged hunter. The book concludes by acknowledging the vast, often unseen distribution of these creatures, noting that while some are common house guests, others are restricted to specific climates or environments, all playing their part in the natural order.

How It Unfolds

The anatomy of a predator The opening chapters define the spider's bodily structure, emphasizing the division between the thorax and abdomen. Detailed illustrations explain how the legs, palpi, and internal organs function as a cohesive, efficient system.

Feeding and the myth of the bite The author challenges common folklore regarding venom, suggesting that mechanical injury and blood loss are the primary threats to an insect caught by a spider. Evidence from naturalists and personal observation is used to argue that spiders are generally docile.

The craft of the web This segment offers a meticulous, functional guide to how spiders manipulate silk. From the building of underground burrows to the complex architecture of round-webs, the reader is walked through the spider's engineering process.

The mystery of flight The book examines the phenomenon of "ballooning," where spiders travel long distances on threads carried by the wind. It reviews accounts from naturalists like Darwin, attempting to explain how these threads are released and controlled.

The cycle of life The final chapters describe the mating rituals, egg-laying, and the development of the young. It explains how physical changes in the adult spider mark the progression from juvenile to mature hunter, concluding with a look at their habitats and winter survival.

The People

The book is less a story of individuals than a study of the naturalists who dedicated their lives to spider observation. The author, J. H. Emerton, acts as a diligent synthesizer of these findings, frequently citing the work of others to provide a comprehensive view. John Blackwall and Menge provide the foundational research on spinning and flying habits, their observations serving as the basis for the author’s own investigations. Mr. Moggridge is the central figure in the study of trap-door spiders, whose patient observation reveals the surprising intelligence with which these creatures conceal their nests. Professor Wilder contributes the most practical perspective, investigating the potential for humans to harvest spider silk—a dream that, while ultimately impractical due to the labor involved, highlights the extraordinary quality of the material. Finally, the "tame spiders" kept by various observers—such as the one kept by Dufour—serve as the human-interest element, demonstrating that these often-maligned creatures are capable of learning and adapting to human presence.

In Its Own Voice

"The numerous stories of deadly poison, supernatural wisdom, and enormous size and strength of spiders, have been omitted as doubtful."

The author explains the editorial intent to prioritize observation over folklore at the start of the book.

"When the cover is closed, it looks exactly like the ground around it."

This line describes the remarkable camouflage used by the trap-door spider to protect its nest.

"Spiders of very different species soon learn to take food from the hand or a pair of forceps, or water from a brush, and will come to the mouth of their bottle, and reach after it on tiptoe."

The author provides an example of how spiders can exhibit surprising behavior when kept in captivity.

What It's Really About

At its core, this book is about the triumph of biological observation over prejudice. It argues that spiders are not monsters of myth but logical, specialized organisms defined by their environment and their tools. By treating the spider as an engineer—a creature that builds, tests, and repairs its surroundings—the author shifts the reader’s perspective from fear to admiration. The underlying question is one of adaptation: how does a creature with such simple biology achieve such mastery over its habitat? The book posits that success in the natural world is measured by one's ability to manipulate the environment, and in the spider, this is achieved through the extraordinary, multi-functional gift of silk.

Why Read It Today

Readers with an interest in natural history, entomology, or the history of science will find this a fascinating, albeit dense, experience. The writing is remarkably clear and devoid of modern sensationalism, reflecting the rigorous, observational style of the late 19th century. It feels like a quiet walk through a meadow or a dusty attic with a patient guide who is eager to show you the "gears" behind the cobweb.

Be aware that this is a technical manual of its time; it does not shy away from the anatomical vocabulary required to understand the subject, and the reader must be prepared for detailed, clinical descriptions of organs and limbs. It is not a narrative-driven story but a systematic exploration. While the period attitudes are evident in its somewhat detached, utilitarian view of nature, the author's genuine curiosity remains infectious. You will likely walk away from this book unable to look at an ordinary corner of your porch or a dew-covered lawn the same way again, seeing not just "dirt," but a marvel of biological engineering.