Astronomy of To-day: A Popular Introduction in Non-Technical Language — A Reader’s Guide

Non-Technical Language and Mathematical Shorthand

Dolmage explicitly addresses the barrier mathematics poses to popular astronomy. He describes mathematical processes as no more than ordinary logic in concentrated form, calling them the shorthand of reasoning. This framing allows him to present main facts and theories without equations, relying instead on verbal explanation and supplementary diagrams. The preface insists that reasoning about celestial orbs is of no different order from everyday affairs, a claim that invites the general reader to engage without specialized training.

The book's structure reflects this commitment: diagrams are not linked by wearying cross-references but are complete in themselves. This design choice minimizes interruption and lets the text flow conversationally. Dolmage's tone throughout the excerpts remains explanatory rather than technical, consistent with his stated goal of making astronomy accessible to a broad audience.

The Martian Canal Controversy: Evidence and Illusion

The excerpts on Mars reveal a nuanced treatment of the canal debate, a topic that had captured public imagination. Dolmage presents Percival Lowell's theory that the straight lines and geometric arrangement of Martian canals indicate artificial irrigation by intelligent inhabitants. He notes that Lowell's views are not wild but are called forth by remarkable observations. The liquid from melting polar caps appears to travel toward the equator and then to the opposite pole, a process Lowell argues must be helped artificially, as by pumping.

However, Dolmage also gives substantial space to skeptical perspectives. He describes experiments by Maunder and Evans in 1902, where schoolboys at varying distances from a disc with faint markings produced drawings that supported the idea that the eye may unconsciously connect point-like markings into lines near the limit of visibility. He then reports that photographs from the 1905 opposition, taken by Lampland at Lowell Observatory, showed several prominent canals as straight dark lines, and later photographs even suggested doubling. Dolmage presents both sides without endorsing either, leaving the reader to weigh the evidence.

Historical Context and the Limits of Inference

Dolmage's preface indicates that the book contains incidental matter concerned with the astronomy of the past, introduced to clarify present understanding. The excerpts do not reveal how extensively historical material appears, but the approach suggests a progressive narrative from earlier ideas to contemporary knowledge. The author's careful hedging—phrases like it is said, appears, and seems a strong point—reflects a cautious empiricism.

Notably, Dolmage refrains from claiming definitive proof for any theory about Mars. He explicitly states that a great deal of nonsense has been written in newspapers about life on Mars, and that no actual evidence of living beings exists. This restraint contrasts with the sensationalism of popular press accounts, positioning the book as a sober corrective. The excerpts do not reveal whether Dolmage ultimately favors Lowell's irrigation hypothesis or the optical illusion explanation; he presents the debate as ongoing, with photographs beginning to tip the scales but not conclusively.

Readers should approach Astronomy of To-day as a snapshot of early twentieth-century popular science, where the author's commitment to non-technical language coexists with unresolved scientific controversies. The Martian canal discussion exemplifies how Dolmage balances competing hypotheses without oversimplifying. Those interested in the history of astronomy or the public understanding of science will find this work a valuable primary source, revealing both what was known and what was debated in 1910.

Holding this 1910 volume, I recalled evenings spent tracing canal lines in my own childhood atlas, wondering at Lowell’s certainty. That same quiet awe returned with Astronomy for Young Folks — Reading Notes years later—not for answers, but for how both books let a beginner simply look up and feel small, yet part of something vast.