biology

John Xantus

John Xantus 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 Xantus rather than just read about it. In short: John Xantus de Vesey a.k.a. de Csíktaplócza (Hungarian: Csíktaplóczai (Vese) Xántus János, 5 October 1825 – 13 December 1894) was a Hungarian exile and zoologist. Xantus (the aristocratic title de Vesey was an affectation, of which he had several variations) was born Xántus János, in Csokonya, Somogy, Hungary.

Key takeaways

John Xantus 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 Xantus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of John Xantus from memory before moving on to harder problems.

Reference excerpt

John Xantus de Vesey a.k.a. de Csíktaplócza (Hungarian: Csíktaplóczai (Vese) Xántus János, 5 October 1825 – 13 December 1894) was a Hungarian exile and zoologist. Xantus (the aristocratic title de Vesey was an affectation, of which he had several variations) was born Xántus János, in Csokonya, Somogy, Hungary. Trained as a lawyer, he served as an officer in the nationalist uprisings of 1848–1849 in the Hungarian Army. Captured and exiled to Prague, he was arrested again, and escaped to the United States via England in 1850. In the U.S. he pursued a variety of occupations, including bookseller, druggist, a teacher, and hospital steward in the U.S. Army. In the Army he met Dr. William Alexander Hammond, a collector for the noted zoologist Spencer Fullerton Baird. Working under Hammond as an assistant surgeon, he soon developed an interest in natural history and became a gifted collector himself. In 1860 he was stationed as a tidal observer at Cabo San Lucas, on the southern tip of the Baja California peninsula, where he collected natural history specimens for the United States National Museum. They still have a collection originating from him. While in Baja California, he published in Hungarian an account that purported to narrate his travels and observations of native antiquities, but which in fact was plagiarized from accounts referring to other regions. He corresponded extensively with Baird, and managed to use the support of Baird and Hammond (later Surgeon General of the United States Army), getting them to write letters of recommendation on his behalf. On the basis of these he was given a consular position in Mexico, a position he promptly lost after embarrassing the Department of State by recognising a local rebelling warlord. Soon after this he returned to Hungary. In 1869 he joined the Austro-Hungarian East Asiatic Expedition, but left it late in 1869 and spent some time in Sarawak before returning to Hungary late in 1870. For 30 years until his death in Budapest in 1894 he served as the director of the Zoological Garden of Budapest and as curator of ethnography at the Hungarian National Museum, as well as undertaking collecting expeditions in Asia. Several zoological and botanical taxa have been named for him: Animals:

Synthliboramphus hypoleucus – Xantus's murrelet [also known as Guadalepe murrelet; considered conspecific with Scripps' Murrelet until 2012] Hylocharis xantusii – Xantus's hummingbird Labrisomus xanti – largemouth blenny, rock blenny Halichoeres xanti – earmuff wrasse (current scientific name, Halichoeres bicolor) Umbrina xanti – Polla drum, golden drum, golden croaker Phyllodactylus xanti – Xantus' leaf-toed gecko, leaf-toed gecko Portunus xantusii – Xantus' swimming crab Xantusiidae, the night-lizards family, plus the subfamily Xantusiinae, and the genus Xantusia Plants:

Clarkia xantiana – Xantus' clarkia, gunsight fairyfan Euphorbia xanti – shrubby euphorbia Chaenactis xantiana – Xantus' pincushion, Mojave pincushion Chorizanthe xanti – Xantus' spineflower Polygala xanti – Xantus's milkwort Mimosa xanti Solanum xanti

References

Illustrations

Worked examples

Example 1 — a first encounter with John Xantus

Start with the simplest possible case. Write down what John Xantus 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 Xantus 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 Xantus 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 Xantus

In research: John Xantus 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 Xantus 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 Xantus is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1825 births, 1894 deaths, 19th-century Hungarian nobility, so understanding it makes those chapters shorter.
In everyday life: Look for John Xantus 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 John Xantus in 20 minutes

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

Frequently asked questions

What is John Xantus in simple terms?

Why does John Xantus 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 Xantus?

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 Xantus.