Spawn of the comet

In Short

When Green's comet passes Earth, it spawns mysterious, cloud-hidden alien medusae that descend to consume all living matter. Narrator Dick Perry and scientist Professor Absolom Davis race against time to understand these electrical monsters as they overrun fields, cities, and skies. Utilizing blowtorches, tanks, and chemical warfare involving prussic acid, humanity eventually strikes back against the invading horrors. This classic pulp science fiction tale endures through its inventive biological terrors, imaginative scientific problem-solving, and a vivid portrait of a world pushed to the brink of extinction.

The Story

The narrative begins in the wake of Green's comet, a celestial visitor with a massive atmosphere of vapor and meteoroids. During a routine airplane flight, narrator Dick Perry witnesses a strange, disk-shaped cloud collide with a plane, causing it to crash fatally. Investigating the wreckage with his companion Sue Davis, Dick discovers peculiar, hair-like strands clinging to the rudder. When Dick touches one, it burrows painfully into his finger like a corrosive, living thread. They take the strange object to Sue’s father, Professor Absolom Davis, an energetic and brilliant experimental scientist working in his home laboratory.

The professor discovers that the strand is a spore or tentacle belonging to a creature that reproduces by fission and grows rapidly when fed organic matter, such as an earthworm or a moth. By analyzing its biology, the professor learns that these medusae of the air generate hydrogen gas to float and discharge powerful electrical shocks when they attack. Soon, similar tragedies occur across the region, including the mysterious disappearance of Banker Crolius and the discovery of a fallen aviator's skull. Overnight, colonies of stalk-like ground medusae sprout across pastures and cornfields, emitting a sickening, charnel odor and menacing local livestock with whip-like tentacles.

As the invasion escalates, the monsters grow larger, divide into disk-shaped segments, and launch themselves into the sky as cloud-hidden predators. Sue is nearly killed during one of these vicious attacks, and major cities report massive congregations of the entities over lakes. Realizing standard weapons are useless, the characters innovate, building tractor-tanks equipped with acetylene torches and discovering that prussic acid and potassium cyanide are fatally toxic to the creatures. The government adopts this chemical strategy, distributing poisoned bullets to airplane fleets that systematically hunt down the flying medusae.

Following a harrowing siege at the professor's home, where monstrous clouds assault the residence while family members defend doors and windows with torches, the global counter-offensive gains momentum. Airplanes coat their ammunition in wax-sealed cyanide and prussic acid, successfully bringing down the invaders by the hundreds. The rotting corpses of the dead monsters are plowed back into the despoiled soil as fertilizer. Over the course of two years, the terrifying scourge is entirely eradicated. The book concludes three years later, as Dick sits peacefully beside the restored clover field where the nightmare began, watching his wife Sue weave a garland of blossoms while the world returns to normal.

How It Unfolds

The fatal collision While out with Sue, Dick watches a cloud-disk collide with an airplane, sending it crashing into a pasture. Inspecting the wreckage, they find mysterious, hair-like strands that burn into Dick's flesh like a corrosive acid.

The laboratory discovery They bring the strands to Professor Absolom Davis, who feeds a piece to an earthworm in his mortar. The professor watches in fascination as the growing creature develops a medusa-like cap, sucker mouths, and hydrogen-generating properties.

The ground invasion Overnight, bizarre cylindrical stalks sprout across local fields, exhaling a nauseating charnel stench. These stationary horrors lash out with electrical tentacles at anything moving, devouring livestock and terrorizing the countryside.

The aerial metamorphosis Well-fed ground stalks transform into stacked disk segments that release hydrogen gas and sail into the sky as massive cloud-hidden predators. Sue is savagely attacked by one such monster, narrowly rescued through the quick use of blowtorches and acid.

The tank offensive To reach essential supplies at the airport, Dick and his helpers armor a caterpillar tractor and mount an acetylene torch on a bamboo pole. They cut a path through the overgrown fields, crushing stalk medusae beneath heavy treads.

The domestic siege While the family monitors radio reports of lake congregations, a giant medusa assaults the professor's home. The inhabitants fight valiantly from windows and doors with torches, successfully repelling the initial onslaught.

The chemical victory The professor discovers that cyanides and prussic acid act as deadly poisons to the creatures' absorbent biology. Armed with this knowledge, government aircraft coat bullets in poison and successfully eradicate the global menace over a two-year campaign.

The People

Dick Perry serves as the observant narrator and active participant in the crisis. He wants to understand the alien threat and protect those he loves, facing physical hazards like corrosive tentacles and electrical shocks. He ends up toughened by the ordeal, driving tanks into battle and helping secure humanity's survival.

Sue Davis is Dick's companion and eventual wife, characterized by her deep empathy and courage. She tends to the wounded, uses blowtorches to defend her family during the siege, and ultimately finds her way back to peace, weaving clover garlands as the nightmare recedes.

Professor Absolom Davis is Sue's father, a small, dynamic man with an iron-gray beard and thick glasses. He wants to decode the biology of the invaders to save humanity. Standing in his way are the creatures' overwhelming strength, electrical defenses, and rapid reproduction. He succeeds brilliantly, discovering their hydrogen buoyancy and fatal vulnerability to prussic acid, leading the intellectual charge against extinction.

Minor figures like the efficient Chinese butler Wong, farm hand Jake Smith, and helper Ole contribute practical labor, operating flame-throwers and heavy machinery. Together, this close-knit household transforms from ordinary suburban residents into a resilient, frontline garrison against an alien invasion.

In Its Own Voice

Early in the narrative, the narrator captures the sudden horror descending from the stratosphere upon an unsuspecting humanity.

Out of the sky came the living clouds that menaced mankind, swooping thirstily down to drink the blood of all earth-life.

While examining a mysterious creature in his laboratory, the professor discovers its unique predatory behavior.

The worm, as you will observe, has all been devoured, or rather, absorbed, except a few segments from the posterior extremity.

Describing the eerie transformation of the landscape, the narrator notes the grim survival of nature after the scourge passes.

The dead hackberry still extends its naked limbs heavenward, but now as if in thanksgiving for the vengeance that has been consummated.

What It's Really About

The book explores the extreme fragility of human civilization when confronted by an indifferent, biologically alien force of nature. It examines the deep tension between scientific inquiry and existential terror, showing how rigorous observation, methodical laboratory experimentation, and prompt technological adaptation can conquer seemingly supernatural threats. Beneath the pulp adventure lies a sharp meditation on ecological disruption, where foreign organisms completely upend terrestrial ecosystems just as aggressive invasive species do in the natural world. Furthermore, it addresses human resilience, demonstrating that community cooperation and applied science can successfully overcome catastrophic planetary crises.

Why Read It Today

Readers who love classic science fiction, inventive biological monsters, and fast-paced apocalyptic survival tales will find plenty to enjoy here. Reading the book feels like experiencing an old-school cinematic creature feature combined with meticulous laboratory procedurals, where every scientific breakthrough brings tangible relief. What stays with you is the striking imagery of cloud-hidden predators, glowing tentacles, and gaunt, lifeless trees standing like monuments against a devastated landscape.

Modern readers should approach the text with an awareness of its historical roots. Written in 1930, the book carries period prose styles, occasional archaic dialects among farm hands, and traditional gender roles typical of early pulp literature. However, these period elements do not detract from the core narrative momentum. For those curious about the roots of modern bio-horror and alien invasion tropes, this novel offers an exceptionally entertaining and imaginative journey. It rewards patience with a uniquely structured battle between human ingenuity and extraterrestrial horror, reminding us how scientific curiosity ultimately secures our place on Earth.