He found that a mouse kept with a plant would survive.

However, we do not recommend to repeat this experiment and hurt innocent animals.

He allowed the system to stand in sunlight for two or three days.

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When he tried to light the candle it would not light.

A modulated chlorophyll fluorometer uses sophisticated electronics to separate chlorophyll fluorescence from ambient light. The systems achieve this using a rapid pulsing excitation light in order to induce a corresponding pulsed fluorescence emission.

A continuous excitation fluorimeter is designed to measure the Kautsky Induction or Fast Chlorophyll Fluorescence Induction (Kautsky and Hirsch, 1931*).


When the system was placed in darkness, the bubbles stopped.

In the interest of genetic engineering and agricultural applications, the authors analyze the relative importance of genes that control both metabolic and light reactions as well as the structure, arrangement, and orientation of photosynthesis.










- Aparna VidyasagarPhotosynthesis History and Discovery Links

In this experiment Ingenhousz demonstrated that plants are dependent on light and their green parts for nutrients and energy.

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Photosynthesis Basics


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Repeat this Experiment:


In another experiment, Ingenhousz, placed a small green aquatic plant in a transparent container of water and exposed the container to bright sunlight.

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Repeat Joseph Priestley's Experiments:







took Priestley’s work further and demonstrated that it was light that plants needed to make oxygen (oxygen was discovered a few years earlier, in 1772 by ).

However, Jan Ingenhousz was the first person to show that light is essential to the plant process that somehow purifies air fouled by candles or animals.

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These kinds of observations led Priestley to offer an interesting hypothesis that plants restore to the air whatever breathing animals and burning candles remove.

This tutorial introduces mitochondria

Today, of course, we can use more sophisticated methods to light the candle like focusing light from a flood light through converging lens, or by an electrical spark.

So priestly proved that plants somehow change the composition of the air.