The Making of Species

In Short

Written in 1909, this treatise systematically surveys the primary evolutionary theories following Charles Darwin’s ground-breaking work. The authors argue that mainstream biological thought has fractured into narrow, dogmatic factions, particularly criticizing the "Wallaceians" for overstating natural selection's scope and the Neo-Lamarckians for unproven assumptions. Instead of offering another speculative doctrine, the book meticulously evaluates real-world animal traits, wild hybrids, and sudden mutations. It contends that while natural selection acts as an environmental filter deciding which organisms survive, the actual creation of new species stems from inherent cellular variations that science has only begun to understand through experimental breeding.

The Story

The book opens with an analytical taxonomy of contemporary biological thought, dividing post-Darwinian evolutionary literature into four distinct camps. The authors locate passionate partisanship in the followers of Alfred Russel Wallace and the Neo-Lamarckians, while noting that Hugo de Vries’s newly introduced mutation theory is often overextended by its creator yet unfairly dismissed by orthodox Darwinists. Finding existing judicial, unbiased texts overly destructive and lacking in constructive alternatives, the authors set out to produce an un-biased synthesis of zoological facts, concealing no anomalies.

Progressing through the debate, the work breaks down the core tenets of the opposing schools. It dismantles the Neo-Lamarckian reliance on the inheritance of acquired characteristics, such as bodily modifications caused by use or disuse, highlighting that structural changes acquired during a parent's life fail to pass down to offspring. Simultaneously, the authors launch a sustained attack on the extreme Neo-Darwinian or "Wallaceian" view, which asserts that natural selection and minute, gradual variations alone explain all living structures. They demonstrate that minor variations lack the requisite "survival value" to determine life or death in the chaotic struggle for existence, using examples of predators effortlessly catching prey regardless of minor physical differences.

The focus then shifts toward alternative mechanisms of variation, emphasizing William Bateson's discontinuous variation and De Vries's mutation theory. Through extensive observations of wild species and domesticated animals, the authors present evidence that distinct traits, such as albinism, melanism, and structural sports, appear suddenly in nature and repeat themselves through internal germ-cell mechanisms. They analyze hybridisation, illustrating how crosses between distinct species often lose highly specialized parent traits or revert to ancestral forms, behaving much like atomic units recombining in chemical reactions.

Addressing complex phenomena like cryptic coloration, mimicry, and sexual selection, the authors argue that many popular adaptations are heavily exaggerated or misunderstood. They expose instances of "false mimicry" and point out that natural selection cannot account for useless or harmful visual traits. Ultimately, the authors conclude that natural selection is merely an elimination process rather than a creative engine. The true makers of species are the internal, inherent properties of protoplasm and germ-cell chemistry. The book ends by pointing away from armchair speculation, declaring that the future of evolutionary science lies in empirical observation and experimental breeding.

How It Unfolds

The survey of evolutionary creeds The authors categorize post-Darwinian literature into four distinct groups, identifying the partisan flaws of Wallaceism and Lamarckism alongside the promising yet incomplete theories of mutation. They establish their objective to provide a non-dogmatic, constructive synthesis of zoological evidence.

The limits of natural selection By examining predator-prey dynamics and minor physical variations, the authors demonstrate that microscopic differences rarely possess true survival value. They argue that selection based on slight, fluctuating variations cannot push a species past rigid natural boundaries.

Mutations and discontinuous variation Turning to the origin of distinct physical traits, the book highlights sudden sports and recurrent mutations, such as crimson-headed finches and color variants in wild birds. These sudden jumps imply that internal cellular factors, rather than gradual environmental sculpting, trigger new physical forms.

The mechanics of hybridisation Analyzing crosses between distinct animal species, the authors show how specialized features disappear in hybrids while ancestral traits re-emerge. They propose that germ-cell unit characters behave similarly to chemical molecules, recombining according to structural biological laws.

Critique of adaptationist theories The authors examine theories of protective coloration, warning colors, and sexual selection, presenting counterexamples like false mimicry and non-adaptive ornamental traits. They reject the idea that every color or pattern in nature must serve an immediate utility.

The true origin of species Concluding the argument, the text frames natural selection as an entrance examination that merely approves or rejects organisms as a whole. The true cause of new species lies within the unexplored molecular behavior of living protoplasm.

The People

• Charles Darwin: The foundational theorist whose core ideas on natural selection and sexual selection are analyzed throughout the book. While the authors respect his work, they argue his followers have expanded his principles into unprovable assumptions regarding the omnipotence of minute variations.
• Alfred Russel Wallace: Co-discoverer of natural selection, represented in the text through his followers ("Wallaceians"). He stands for the strict view that natural selection explains virtually every physical detail of an organism, a stance the authors vigorously challenge as an inflexible creed.
• Jean-Baptiste Lamarck: The early evolutionist whose modern adherents contend that acquired physical traits and the effects of use or disuse are passed down to offspring. The authors treat his school as unsupported by concrete inheritance evidence.
• Hugo de Vries: The Dutch botanist who introduced the mutation theory, positing that new species arise suddenly through sudden jumps rather than gradual changes. The authors view his work as a vital breakthrough, though currently exaggerated by its author.
• William Bateson: A key pioneer in genetics whose concepts of discontinuous variation are used by the authors to explain how physical sports and sudden mutations occur natively in wild populations.

In Its Own Voice

"Science commits suicide when it adopts a creed."

The authors quote T.H. Huxley in their preface to warn against the rigid partisan factions that had divided early twentieth-century evolutionary biology.

"The real makers of species are the inherent properties of protoplasm and the laws of variation and heredity."

This central assertion summarizes the book's thesis that internal cellular mechanisms, rather than external selective pressures, generate new biological forms.

"The future of biology is largely in the hands of the practical breeder."

In their closing perspective, the authors emphasize that experimental observation will resolve evolutionary mysteries where theoretical speculation fails.

What It's Really About

At its core, the book addresses the limits of natural selection as an explanatory model for biological diversity. The authors argue that mainstream biology has conflated the survival of a species with its creation. While environmental pressures determine which organisms endure, natural selection cannot originate a single new physical feature. Instead, the authors explore the internal mechanics of life—how protoplasm varies, how mutations recur, and how germ cells combine discrete unit characters. The book challenges the tendency of scientists to invent adaptive explanations for every obscure trait, advocating for scientific humility when facing phenomena that current knowledge cannot yet fully explain.

Why Read It Today

This work offers a historical snapshot of evolutionary biology during a dramatic transitional era—the years between the rediscovery of Mendel’s work and the modern synthesis of genetics and natural selection. Readers interested in the history of science will appreciate its clear, unpretentious prose and its refreshingly skeptical approach to scientific orthodoxy.

The text is remarkably readable, free from impenetrable jargon, and rich with vivid natural history observations—from the color variations of wild petrels and skunks to the breeding traits of turbit pigeons and pheasants. Because it was written in 1909, readers must navigate early twentieth-century scientific terminology and dated theoretical classifications. However, its core lesson remains strikingly modern: scientific theories must always yield to empirical facts, and biological systems are far too complex to be reduced to a single sweeping doctrine.