It's only speculation.
3 seconds sound clip from the The War of the Worlds (1953) movie soundboard.
You can hear this line at 00:22:52 in the DVD version of the movie.
Quote context
[...]
- Their senses could be quite different from ours.
- They may, for instance, be able to smell colors.
- Precedent in our own evolution makes it possible that they have more than one brain.
- Now, Dr. Forrester, what about these meteor machines?
- Thank you, Dr. Forrester. (2)
- Oh, colonel, can you tell us anything about this plane that's coming over?
- It will drop a flare. That's the only way we dare put a light on them.
[...]