astronomy

Henri Lucien Jumelle

Henri Lucien Jumelle is a astronomy 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 Henri Lucien Jumelle rather than just read about it. In short: Henri Lucien Jumelle (French pronunciation: [ɑ̃ʁi lysjɛ̃ ʒymɛl]; 25 November 1866 in Dreux, Eure-et-Loir Department, France – 6 December 1935 in Marseille, Bouches-du-Rhône Department, France) was a French botanist. Life and career From 1887 to 1894, he worked as a plant physiologist at the Faculté des Sciences in Paris.

Key takeaways

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

Reference excerpt

Henri Lucien Jumelle (French pronunciation: [ɑ̃ʁi lysjɛ̃ ʒymɛl]; 25 November 1866 in Dreux, Eure-et-Loir Department, France – 6 December 1935 in Marseille, Bouches-du-Rhône Department, France) was a French botanist.

Life and career From 1887 to 1894, he worked as a plant physiologist at the Faculté des Sciences in Paris. Afterwards, he was a professor of botany at the Faculté des Sciences in Marseille (1894-1935). From 1898 to 1916, he was assistant director, then director of the Musée colonial et du Jardin botanique in Marseille. He held a deep interest in applied botany, publishing numerous treatises on the agricultural aspects of various plants. During his career, he worked closely with botanist Joseph Alfred Perrier de la Bâthie, who sent him botanical material from Madagascar. As a taxonomist, he circumscribed many new species native to Madagascar. From 1922 to 1935, he was a correspondent-member of the Académie des Sciences (botanical section).

Botanical eponymy Jumellea (family Orchidaceae), named by Rudolf Schlechter, 1914. Jumelleanthus (family Malvaceae), named by Bénédict Pierre Georges Hochreutiner, 1924.

Selected works Recherches physiologiques sur le développement des plantes annuelles, 1889. Le laboratoire de biologie végétale de Fontainebleau dirigé par Gaston Bonnier, 1890. Les cultures coloniales (8 volumes), 1901–1927. Les ressources agricoles et forestières des colonies françaises, 1907. Les plantes à tubercules alimentaires des climats tempérés et des pays chauds, 1910. Catalogue descriptif des collections botaniques du Musée colonial de Marseille : Madagascar et la Réunion, 1916.

References

Worked examples

Example 1 — a first encounter with Henri Lucien Jumelle

Start with the simplest possible case. Write down what Henri Lucien Jumelle claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Henri Lucien Jumelle 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 Henri Lucien Jumelle 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 Henri Lucien Jumelle

In research: Henri Lucien Jumelle appears in astronomy 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 Henri Lucien Jumelle 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: Henri Lucien Jumelle is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1866 births, 1935 deaths, 20th-century French botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Henri Lucien Jumelle 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.

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How to study Henri Lucien Jumelle in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Henri Lucien Jumelle 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 Henri Lucien Jumelle out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Henri Lucien Jumelle in simple terms?

Why does Henri Lucien Jumelle matter?

Because it connects several astronomy 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 Henri Lucien Jumelle?

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 Henri Lucien Jumelle.