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astronomy

Theo Holm

Theo Holm 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 Theo Holm rather than just read about it. In short: Herman Theodor Holm (February 3, 1854 – December 26, 1932) was a Danish-American systematic botanist, agriculturalist and plant pathologist. His works dealt principally with plants from the Arctic and from the Rocky Mountains, mainly taxonomy and morphology.

Key takeaways

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

Reference excerpt

Herman Theodor Holm (February 3, 1854 – December 26, 1932) was a Danish-American systematic botanist, agriculturalist and plant pathologist. His works dealt principally with plants from the Arctic and from the Rocky Mountains, mainly taxonomy and morphology. He published over 150 papers reflecting his research which included his series Studies on the Cyperaceae and Medicinal Plants of North America.

Biography Herman Theodor Holm was born in Copenhagen, Denmark. He studied botany at the University of Copenhagen under professor Eugenius Warming and graduated 1880. In 1882–1883, he participated in the expedition on board the Danish vessel Dijmphna (the Dijmphna expedition 1882-83) to the territory between Russia and the North Pole during the First International Polar Year. The ship was icebound for a period in the Kara Sea. He also explored the flora of West Greenland as assistant to Eugenius Warming on the Fylla expedition in 1884. He emigrated to the U.S., landing in New York City on April 12, 1888. He soon was employed as assistant botanist by the U.S. National Museum. In 1893 when he received American citizenship. From 1893 to 1897, he was assistant pathologist with the United States Department of Agriculture (USDA). He obtained his Ph.D. in botany from the Catholic University of America in Washington D.C. in 1902. He then moved to the countryside of Brookland, DC and later in Clinton, Maryland and did assistant work as a botanist for the Smithsonian Institution and the USDA. Although a Lutheran, in 1932 he joined the faculty of the Catholic University of America, but died soon after.

Honors The small-reed species Calamagrostis holmii Lange is named for him.

Selected scientific works Novaia-Zemlia’s Vegetation, særligt dens Phanerogamer. Dijmphna-Togtets zoologiske-botaniske udbytte (1885) Contributions to the knowledge of the germination of some North American plant (1891) Notes on the flowers of Anthoxanthum odoratum L. (1892) Some new anatomical characters for certain Gramine (1903) Commelinaceœ. Morphological and anatomical studies of the vegetative organs of some North and Central American species (1906) Contributions to the morphology, synonymy, and geographical distribution of arctic plants (1922) The vegetation of the alpine region of the Rocky Mountains in Colorado (1923) Hibernation and Rejuvenation, Exemplified by North American Herbs (American Midland Naturalist) (1925),Vol. 9 (9): 439-476, Vol. 9 (10): 477-512. The title probably alludes to the title of the first work on plant life-form, Om Skudbygning, Overvintring og Foryngelse [translated title: On shoot architecture, hibernation and rejuvenation] (1884) by Eugen Warming, Holm's former mentor in Copenhagen, who had died the year before. At the end of the second part, Holm gives a list of all his papers on life form - related morphology and anatomy of American plants, ordered by genus.

Note

Sources Woods, A.F. (1933) Herman Theodor Holm. Science 77 (1990): 183-184. Tucker, A.O., Poston, M.E. & Iltis, H.H. (1989) History of the LCU Herbarium, 1895-1986. Taxon 38 (2): 196-203.

References

Worked examples

Example 1 — a first encounter with Theo Holm

Start with the simplest possible case. Write down what Theo Holm 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 Theo Holm 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 Theo Holm 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 Theo Holm

In research
Theo Holm 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 Theo Holm 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
Theo Holm is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1854 births, 1932 deaths, 19th-century Danish botanists, so understanding it makes those chapters shorter.
In everyday life
Look for Theo Holm 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 Theo Holm in 20 minutes

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

Frequently asked questions

What is Theo Holm in simple terms?

Herman Theodor Holm (February 3, 1854 – December 26, 1932) was a Danish-American systematic botanist, agriculturalist and plant pathologist. His works dealt principally with plants from the Arctic and from the Rocky Mountains, mainly taxonomy and morphology.

Why does Theo Holm 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 Theo Holm?

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 Theo Holm.

Tags

  • 1854 births
  • 1932 deaths
  • 19th-century Danish botanists
  • 20th-century American botanists
  • American Lutherans
  • Botanists active in the Arctic
  • Catholic University of America alumni
  • Catholic University of America faculty
  • Danish emigrants to the United States
  • University of Copenhagen alumni

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