Who discovered that ripe oranges emitted a volatile substance?

Explanation

### Step-by-Step Solution:

1. **Identify the Discovery**: The question asks about the discovery of a volatile substance emitted by ripe oranges. This discovery was made by a scientist named Cousins in 1910.

2. **Understanding the Substance**: The volatile substance emitted by ripe oranges was found to hasten the ripening of nearby unripe bananas. This indicates that the substance plays a significant role in the ripening process of fruits.

3. **Further Research**: In 1934, R. Jane conducted further research using gas chromatography and identified that the volatile substance responsible for ripening was ethylene gas.

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