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Black Smoker at Mid-Ocean Ridge Hydrothermal Vent

Difference Between 
Spontaneous Generation & Abiogenesis


Aristotle's Thoughts on Spontaneous Generation
Aristotle was one of the first to record his conclusions on the possible transition from nonliving to living. According to Aristotle, it was readily observable that aphids arise from the dew on plants, fleas from putrid matter, and mice from dirty hay; and this belief remained unchallenged for more than two thousand years.

Investigation of Microbial Life
In the 1600’s the first microscopes were crafted. These new instruments, pioneered by Robert Hooke and Antonie van Leeuwenhoek, enabled scientific investigators to observe tiny living organisms that were previously unknown. Where did these tiny microbes come from? Did they generate spontaneously from nonliving material, or did microbes and other living organisms only arise from other living organisms?

Article Summary: Spontaneous generation is the debunked idea that life can, on a daily basis, arise from nonliving material. Abiogenesis attempts to explain how life on Earth began.
Comparison of Spontaneous Generation & Abiogenesis
An electron micrograph of bacteriophages attached to a bacterial cell.
Swan-necked flask used in Pasteur's experiments to disprove spontaneous generation. Click here for animation and quiz.
Virtual Microbiology

You have free access to a large collection of materials used in a college-level introductory microbiology course. The Virtual Microbiology Classroom provides a wide range of free educational resources including PowerPoint Lectures, Study Guides, Review Questions and Practice Test Questions.
Prokaryotic Cell, Mariana Ruiz
In modern science, it is understood that living things arise from other living things. This is cell theory; the knowledge that cells (the basic units of life) come from preexisting cells. 
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Continued ... 
What Is Abiogenesis?
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​Page last updated: 8/2015
Instructor's Corner
from the free STEM 
education site 
Science Prof Online
But life had to begin at some point. So what is it that makes the discredited theory of spontaneous generation a fallacy and abiogenesis solid science?

What Is Spontaneous Generation?
Spontaneous generation is the belief that, on a daily basis, living things arise from nonliving material, and this idea was entrenched throughout most of recorded history.
Francesco Redi demonstrated that maggots come from flies, not from putrid material. Lazzaro Spallazani revealed that microbes could be eliminated from broth that was placed in sealed containers and heated to high temperatures.
The invention and refinement of microscopes heated up the debate over spontaneous generation, and spawned a slew of research, over the next 200 years, that would finally put an end to this idea.

Learn More About Spontaneous Generation
on the
History of Microbiology Lecture Main Page
Finally, Louis Pasteur, the French chemist and all around scientific overachiever, performed several experiments which demonstrated conclusively that life arose from only from living predecessors.
384 - 322 BC
Francesco Redi  1626—1697
Francesco Redi 
Dig the wig!