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astronomy

Marcus Hartog

Marcus Hartog 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 Marcus Hartog rather than just read about it. In short: Marcus Manuel Hartog (19 August 1851, London – 21 January 1924, Paris) was an English educator, natural historian, philosopher of biology and zoologist in Cork, Ireland. He contributed to multiple volumes of the Cambridge Natural History.

Key takeaways

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

Reference excerpt

Marcus Manuel Hartog (19 August 1851, London – 21 January 1924, Paris) was an English educator, natural historian, philosopher of biology and zoologist in Cork, Ireland. He contributed to multiple volumes of the Cambridge Natural History.

Life Hartog was born in London 1851, the second son of the Professor Alphonse Hartog (died 1904) and Marion (née Moss, 1821–1907), younger brother of Numa Edward Hartog and elder brother of Sir Philip Joseph Hartog, Academic Registrar of London University and Vice-Chancellor of the University of Dacca. His two younger sisters were the pianist and composer Cécile Hartog and the portrait painter Héléna Arsène Darmesteter, Marcus Hartog was educated at the North London Collegiate School, University College, London, and Trinity College, Cambridge, where he took a first class in the National Science Tripos in 1874, and went out in the same year to Ceylon as assistant to the Director of the Royal Botanic Gardens — a post that he held for three years. On his return he became a demonstrator, and afterwards a lecturer in natural history at Owens College, Manchester. In 1882 he began an association of more than 40 years with the educational life of Cork. For 27 years he was Professor of Natural History at Queen's College, Cork (1882–1907), and in 1909 proceeded to the chair of Zoology in what had become University College Cork. When in 1921 he vacated the appointment, he was made Emeritus Professor. Hartog was a Lamarckian. He argued for the inheritance of acquired characteristics and identified as a vitalist. He supported the non-Darwinian evolutionary ideas of Samuel Butler and wrote a supportive introduction to his book Unconscious Memory. He argued that cell division occurs due to a new force he termed "mitokinetism". Hartog died in Paris on 21 January 1924.

Selected publications Hartog contributed articles to the Dictionary of National Biography and the Encyclopædia Britannica, as well as writing many articles for scientific journals.

Problems of Life and Reproduction (1913) The True Mechanism of Mitosis (1914)

Family In 1874 in Paris, France, Hartog married Blanche Levy, daughter of R. Levy, of Paris, and had issue.

References

External links Works by or about Marcus Hartog at the Internet Archive

Worked examples

Example 1 — a first encounter with Marcus Hartog

Start with the simplest possible case. Write down what Marcus Hartog 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 Marcus Hartog 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 Marcus Hartog 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 Marcus Hartog

In research
Marcus Hartog 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 Marcus Hartog 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
Marcus Hartog is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1851 births, 1924 deaths, 19th-century British zoologists, so understanding it makes those chapters shorter.
In everyday life
Look for Marcus Hartog 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 Marcus Hartog in 20 minutes

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

Frequently asked questions

What is Marcus Hartog in simple terms?

Marcus Manuel Hartog (19 August 1851, London – 21 January 1924, Paris) was an English educator, natural historian, philosopher of biology and zoologist in Cork, Ireland. He contributed to multiple volumes of the Cambridge Natural History.

Why does Marcus Hartog 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 Marcus Hartog?

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 Marcus Hartog.

Tags

  • 1851 births
  • 1924 deaths
  • 19th-century British zoologists
  • 19th-century English botanists
  • 20th-century English botanists
  • 20th-century English zoologists
  • Academics of Queens College Cork
  • Academics of University College Cork
  • Alumni of Trinity College, Cambridge
  • Alumni of University College London
  • English Jews
  • English people of French descent

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