A dictionary of scientific terms

In Short

A Dictionary of Scientific Terms by Leo Markun is a compact reference volume published in 1927 that catalogs foundational concepts across physics, chemistry, biology, and related fields. Rather than offering a traditional narrative, the book progresses alphabetically through precise definitions, clarifying complex ideas for the literate layman. It has endured as a fascinating historical snapshot of scientific thought, capturing the terminology of an era when researchers were actively debating the limits of energy, atoms, and evolution.

The Story

Leo Markun opens his reference work with a candid preface addressing the inherent limits of completeness, noting that physics, chemistry, and biology provide the lion's share of terminology. He reflects on the broader landscape of knowledge, observing that specialists frequently quarrel over foundational terms like ether or instinct. From the outset, the text considers what separates science from common sense, philosophy, theology, and superstition.

As the work transitions into its alphabetical sequence, it establishes a vast vocabulary for understanding the natural world. It moves swiftly from basic physiological and anatomical terms, such as abasia and abdomen, into complex chemical and physical phenomena. Readers encounter precise distinctions regarding elements like argon, arsenic, bismuth, and boron, alongside physical measurements such as the ampere, Joule, and ohm. The text systematically diagrams the material universe, detailing atomic structures, radiation types from alpha to gamma rays, and thermodynamic principles including latent heat and Boyle’s law.

Moving into biology and botany, the lexicon maps the intricacies of living organisms. Entries detail cellular structures, reproductive mechanisms like cross-pollination and gametes, and inheritance through Mendel’s law. The text explains organic processes such as metabolism, anabolism, and osmosis-related colloid behaviors, while situating humanity within broader classifications through zoology, anthropology, and evolutionary frameworks tied to Darwinism. Geological time scales, from the Archean and Cambrian to the Cenozoic, provide a structural framework for understanding Earth's history alongside meteorological and astronomical entries tracking cyclones, anticyclones, stellar spectra, and planetary orbits.

As the argument progression moves toward abstract and applied domains, the text incorporates critical distinctions from thinkers like H.W. Fowler on the divergence between science and art, noting that science knows while art does. It examines psychology, psychiatry, and psychical research, evaluating intelligence quotients and mental disorders with clinical precision. Philosophy and history are weighed for their scientific validity, with Will Durant cited on the necessity of philosophy to direct the proper use of accumulated knowledge. The text questions traditional viewpoints, challenging vitalism and exploring the fluid boundaries where empirical observation meets theoretical speculation.

The progression concludes with advanced physical states and specialized studies, touching upon uranium radioactivity, X-rays, and electrical inductance before terminating at the study of fermentation chemistry in zymurgy. Through this meticulous accumulation of terms, the volume outlines the architecture of early-twentieth-century knowledge, leaving the reader with a comprehensive map of how science defines its own universe.

How It Unfolds

The boundaries of knowledge Leo Markun acknowledges in his opening preface that no single volume can achieve complete coverage of all scientific disciplines. He outlines the necessity for definitions that remain intelligible to literate laymen rather than isolating themselves within specialist jargon, while touching upon the hazy borders where science meets philosophy, theology, and superstition.

The physical and chemical substrate The early entries establish foundational terms for matter, energy, and atomic elements ranging from aluminium and arsenic to boron. Complex physical forces, electrical units like the ampère and ohm, and distinct radiation types are systematically broken down to explain how scientific instruments measure the material world.

The architecture of life Moving deep into biology, botany, and zoology, the text details cellular mechanics, plant anatomy, and hereditary principles. Entries on metabolism, chromosomes, symbiotic relationships, and Mendel's law map out the complex biological systems governing both simple organisms and higher vertebrates.

Deep time and celestial mechanics The lexicon expands outward to encompass vast geological epochs and astronomical bodies. Definitions of planetary orbits, stellar spectra, atmospheric pressure lines like isobars, and stratified rock formations ground the reader in the immense timescales of Earth and the wider universe.

Mind, art, and final definitions The final stretch explores psychology, intelligence quotients, mental disorders, and critical distinctions between science and art. The volume closes with specialized chemical processes, radioactive elements like uranium, and obscure technical vocabulary ending with the chemistry of zymurgy.

The People

Although structured as a dictionary rather than a narrative, the book engages directly with key thinkers and scientists whose ideas shaped modern understanding. Charles Robert Darwin emerges as a central figure through the framework of Darwinism, seeking to explain organic evolution through natural selection. He faces the challenge of complex biological variation, ultimately shifting how science perceives the origin of species, though noting that not all biologists accept his narrow definitions.

Gregor Mendel appears through his foundational work on heredity, seeking predictable patterns in the transmission of traits. By crossing dissimilar plants and animals, Mendel encounters the hidden dominance and recessiveness of genetic traits, establishing a lasting statistical law that transforms biological inheritance from guesswork into an exact science.

H.W. Fowler contributes critical philosophical clarity by distinguishing between science and art, wanting to establish firm boundaries for human activity. He argues against confusion by asserting that science knows while art directs, drawing a sharp line between theoretical truth and traditional skill.

Will Durant enters through discussions on philosophy, emphasizing the urgent necessity for philosophical direction as various sciences expand. He confronts the threat of fragmented knowledge, arguing that philosophy must guide the proper use of human understanding.

Finally, Albert Einstein casts a shadow over classical mechanics, particularly through concepts like statics where he challenges traditional assumptions by asserting that no body is ever truly at rest. Each figure or idea struggles against ambiguity, pushing the boundaries of definition to leave the reader with a more rigorously organized view of reality.

In Its Own Voice

Addressing the inevitable limitations of compiling a concise handbook of specialized knowledge, the author notes in the preface:

Completeness is a virtue which this little Blue Book cannot, in the nature of things, possess.

Distinguishing between empirical observation and practical human creation, the text borrows a precise formulation:

Science knows, art does; a science is a body of connected facts, an art is a set of directions; the facts of science (errors not being such) are the same for all people, circumstances, and occasions; the directions of art vary with the artist and the task.

Clarifying the strict parameters of empirical generalization, the dictionary defines an immutable scientific rule:

A scientific law does not direct or impose penalties or state that things ought to behave in a certain way.

What It's Really About

Beneath its alphabetical arrangement, the book grapples with the fundamental scope and limits of human knowledge. It investigates what separates rigorous empirical science from common sense, philosophy, theology, and superstition. A central theme is the attempt to codify an increasingly complex industrial and natural world into intelligible language, balancing specialized technical definitions with terms accessible to literate laymen. Furthermore, it explores the tension between theoretical truth and practical application, questioning whether disciplines like psychology, history, and philosophy have achieved true scientific standing. Ultimately, the work asks how human beings categorize reality, map physical forces, and define the boundaries of living organisms in an expanding universe of thought.

Why Read It Today

Readers fascinated by the history of ideas and the evolution of scientific vocabulary will find this little volume deeply rewarding. Reading it feels like stepping into a 1920s intellectual archive, where physics, chemistry, and early twentieth-century psychology sit side by side in neat, unpretentious rows. What stays with you is the striking snapshot of a transitional scientific era—a time when electrons were newly conceptualized, intelligence quotients were being standardized, and atomic theory was rapidly shifting.

Modern readers should approach the text with historical honesty regarding its period attitudes and limitations. As the author readily admits, the volume cannot cover every branch of knowledge completely, and some definitions reflect the provisional scientific consensus or debates of the 1920s, particularly around psychology, instinct, and the elusive ether. It lacks modern gloss or marketing hype, presenting its definitions with dry precision and plain confidence. For anyone curious about how our ancestors categorized the physical universe before the digital age, Markun’s dictionary offers a charming, educational, and refreshingly direct window into the past.