Because the walls are too close together to make an echo.
How far away must the reflection of a sound be made, so as to produce a perfect echo?
Sound must be made not less than one hundred and twelve feet distant to produce a perfect echo.
How many syllables can be heard from an echo one hundred and twelve feet distant?
Only one syllable can be heard.
How far must the echo be to hear two syllables?
It must be twice the one hundred and twelve feet, or two hundred and twenty-four feet, to hear two syllables; and three times that distance to hear three syllables, and so on.
Why can a person when speaking, be heard better in a room than in the open air?
Because the walls of the building reflect his voice to the hearers, so that more waves of sound reach their ears.
Why are noises heard so distinctly in an unfurnished dwelling?