biology

John Needham

John Needham is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand John Needham rather than just read about it. In short: John Turberville Needham FRS (10 September 1713 – 30 December 1781) was an English biologist and Roman Catholic priest. He was first exposed to natural philosophy while in seminary school and later published a paper which, while the subject was mostly about geology, described the mechanics of pollen and won recognition in the botany community.

Key takeaways

John Needham belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect John Needham to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of John Needham from memory before moving on to harder problems.

Reference excerpt

John Turberville Needham FRS (10 September 1713 – 30 December 1781) was an English biologist and Roman Catholic priest. He was first exposed to natural philosophy while in seminary school and later published a paper which, while the subject was mostly about geology, described the mechanics of pollen and won recognition in the botany community. He did experiments with gravy and later, tainted wheat, in containers. This was in order to experiment with spontaneous generation. Needham was curious on how this term was relevant. The experiments consisted of briefly boiling a broth mixture and then cooling the mixture in an open container to room temperature. Later, the flasks would be sealed, and microbes would grow a few days later. Those experiments seemed to show that there was a life force that produced spontaneous generation. Today, it is known that the boiling time was insufficient to kill any endospores of microbes and the cooling of flasks left open to the air could cause microbial contamination. It could also be ascertained that Needham did not use proper sterile technique. His experiments were later challenged and repeated by Lazzaro Spallanzani, an Italian scientist. Using a slightly different protocol (with a longer boiling time), Spallanzani did not have any microbes grow in his sealed flasks, contradicting Needham's findings. He is frequently believed to be an Irish Jesuit, a myth which was created by Voltaire during a feud regarding spontaneous generation in which Voltaire was against Needham and his theories. He became a member of the Royal Society in 1747 and was the first Catholic priest to do so. Needham's experiments with the spontaneous generation of life were cited by French Enlightenment philosopher Baron d'Holbach in his atheist work, the System of Nature.

Works

An Account of Some New Microscopical Discoveries. 1745. Gallica. New microscopical discoveries. 1745. BHL. Letter from Paris. London: Charles Davis. 1746. Observations upon the Generation, Composition, and Decomposition of Animal and Vegetable Substances. 1749. BHL. Nouvelles recherches physiques et métaphysiques sur la nature et la religion (in French). Paris: Jacques Lacombe. 1769.

Editions New microscopical discoveries (in French). Leiden: Elie Luzac. 1747.

External links Encyclopædia Britannica Biography at Science World

Illustrations

Worked examples

Example 1 — a first encounter with John Needham

Start with the simplest possible case. Write down what John Needham claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to John Needham before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about John Needham ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of John Needham

In research: John Needham appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses John Needham in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: John Needham is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1713 births, 1781 deaths, 18th-century British biologists, so understanding it makes those chapters shorter.
In everyday life: Look for John Needham outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study John Needham in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what John Needham means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain John Needham out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is John Needham in simple terms?

Why does John Needham matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study John Needham?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on John Needham.