An Elementary Study of Insects — Inside the Classic

From Orders to Individuals: The Book’s Architecture

The table of contents reveals a deliberate progression. After an introduction and a chapter on collecting and preserving specimens, Haseman treats seventeen insects in sequence: grasshopper, house fly, mosquito, cabbage miller, apple worm, tomato worm, firefly, white grub, Colorado potato beetle, lady-beetle, dragon-fly, squash bug, plant-louse, honey bee, and ant. Each chapter follows the same two-part division: a “Brief discussion” of the insect’s life cycle and economic role, then “Observations and studies” that guide the student through hands-on work.

This repetitive structure serves a pedagogical purpose. By encountering the same format again and again, the student internalizes a method of entomological inquiry: identify the pest, learn its stages, observe its behavior, and consider control measures. The chapters are not meant to be read straight through but used as modular units, each self-contained enough for a classroom lesson. The book’s movement is thus cyclical rather than linear, returning to the same observational framework with each new subject.

The Language of Direct Instruction

Haseman’s prose is consistently imperative. In the apple worm chapter, he writes: “Describe the moth and pin a number of them for your collection.” The tomato worm chapter commands: “Disturb them and hear them grind their jaws together.” These directives are interspersed with questions: “What time in the spring do the caterpillars change to the pupa?” and “Do they eat the foliage rapidly?” The voice is that of a teacher standing beside the student, guiding each step.

This instructional tone extends to the book’s treatment of danger. The tomato worm’s horn is described as “thought to be a sting but it is only an ornament and entirely harmless”—a reassurance that also teaches. The house fly chapter warns of disease but focuses on practical eradication. The language never becomes alarmist; it remains matter-of-fact, grounded in the observable. Even when discussing parasites that “bore out through the skin,” the description is clinical, aimed at understanding rather than sensationalism.

Recurring Images: The Worm, the Pupa, and the Parasite

Certain images recur across chapters, creating a visual vocabulary. The tomato worm is described as “dark green with a number of slanting white lines along either side,” and the apple worm as a “small pink worm.” The pupal stage is repeatedly emphasized: the tomato worm’s “large, oval, brown pupa with a jug-handle-like appendage,” the codling moth’s “small silk cocoons.” These descriptions are precise enough for identification but also evoke the transformation central to insect life.

Parasitic wasps appear in multiple chapters as a natural control. The tomato worm chapter notes that “often a hundred or more may come out of one worm.” This image—of tiny wasps emerging from a caterpillar—is both vivid and instructive, illustrating biological control without moralizing. The book’s recurring focus on the worm stage, the pupa, and the parasite ties together the economic and biological threads, showing how each insect’s life cycle offers points for intervention.

Movement Between Scales: From the Field to the Specimen Jar

The book constantly shifts between outdoor observation and indoor study. The grasshopper chapter begins with “Field studies” and moves to “Breeding cage observations.” The tomato worm chapter instructs: “Collect a number of the worms in a glass fruit can and give them tomato leaves to eat and watch them grow.” This movement is not just spatial but temporal: students are asked to observe insects across seasons, from winter cocoons to spring moths.

Haseman also moves between the individual and the agricultural landscape. The apple worm chapter asks: “What proportion of apples in your region are wormy?” and “Are the trees sprayed just after the blossoms fall?” These questions connect the specimen in the jar to the orchard outside. The book’s structure thus mirrors the entomologist’s practice: zooming in from the field to the lab, from the pest population to the single insect, and back out to the farmer’s problem. This oscillation between scales is the book’s most distinctive structural feature.

Readers approaching An Elementary Study of Insects will find it most useful as a workbook rather than a reference. The chapters are designed to be performed, not merely read. Following Haseman’s instructions—collecting, pinning, observing, and questioning—will yield a deeper understanding than skimming the text. The book’s value lies in its method: a systematic, hands-on approach to entomology that remains relevant for anyone wishing to learn how to look at insects closely.

There's something tender about old schoolbooks—their faith that a child's careful eye on a tomato worm matters. That patience lingers in A Synopsis of the American Bats of the Genus Pipistrellus — Story, Setting & Ideas, where even the smallest flutter gets its own quiet taxonomy. I suppose we never really stop wanting things named, just to hold them closer.