there was once a little scotch boy named james watt. he was not a strong child, and could not always run and play with other boys, but had often to amuse himself at home. one holiday afternoon little james amused himself in this way. he held a saucer over the stream of steam which came from the spout of a boiling kettle, and as he watched he saw little drops of water forming on the saucer. he thought this was very strange, and wondered why it happened, for he did not know that steam is just water changed in form by the heat, and that as soon as it touches something cold it turns again into water. he asked his aunt to explain it, but she only told him not to waste his time. if she could have foreseen the work which her nephew would do when he became a man, she would not have thought he was wasting his time.