Science Library - free educational site

Julius von Sachs

1832 - 1897

Julius von Sachs

Julius von Sachs was a German botanist who was a pioneer of plant physiology.

  • Nationality
  • German

  • Subject
  • Biology

  • Fields
  • Botany, photosynthesis, plant physiology

  • Posts
  • Professor of Botany at the Poppelsdorf Agricultural Institute (near Bonn), 1861 - 1867.

    Professor of Botany at W├╝rzburg University, 1868 - 1897

    Member of the Bavarian Science Academy (Bayerischen Akademie der Wissenschaften), 1874 - 1897.

    Foreign member of the Royal Netherlands Academy of Arts and Sciences, 1885.

  • Publications
  • Sachs was a prolific writer, and produced more than 12 books which had enormous influence on the world of botany. Amongst these were:

    Handbuch der Experimentalphysiologie, 1865 (Handbook of Experimental Physiology).

    Lehrbuch der Botanik, 1868 (Textbook of Botany).

    Vorlesungen uber Pflanzenphysiologie, 1882 (Lectures on Plant Physiology).

    Geschichte der Botanik, 1875 (History of Botany).

  • Theories
  • Cell physiology, germination

    Branching of roots

    Explanation of photosynthesis and plant development.

  • Experiments/Discoveries
  • Sachs developed the 'Auxanometer', an instrument for measuring the rate of plant growth by means of a pulley which amplifies the change in height of a plant.

    Discovery and proof of starch. Sachs showed that a leaf deprived of light does not develop starch, by using iodine which colours starch.

    Water culture methods and investigation of nutrition

Read about biology on
Auxanometer, invented by Julius von Sachs, to measure plant growth

Sachs is synonymous with the development of plant physiology in the second half of the 19th century. A brilliant experimentalist as well as theoretician, teacher and author, his contributions are unequalled to our understanding of plant growth, chloroplasts, photosynthesis and experimental techniques.

Latest Item on Science Library:

The most recent article is:


View this item in the topic:

Vectors and Trigonometry

and many more articles in the subject:

Subject of the Week


Information Technology, Computer Science, website design, database management, robotics, new technology, internet and much more. JavaScript, PHP, HTML, CSS, Python, ... Have fun while learning to make your own websites with

Computer Science

Great Scientists

John Herschel

1792 - 1871

John Herschel is the son of William Herschel, and the nephew of Caroline Herschel, two famous astronomers. He continued his father's work, publishing enhanced catalogues of astronomical objects, but was also prolific in many other fields of science and technology, notably as a pioneer of photography.

John Herschel
Transalpine traduzioni

Quote of the day...

"Today, I am feeling generous," announced Napoleon. "Is that not right, Bourrienne?"
His secretary hurriedly searched for and then through his agenda. "Today... yes, today you are generous, magnanimous and gentle."
"And tomorrow?"
"Brutal patches but otherwise calm."

Renewable.Media Internet Promotions

English language school