These things seemed content, on the whole, to let mankind alone; though they were at times held responsible for the disappearance of venturesome individuals—especially persons who built houses too close to certain valleys or too high up on certain mountains. Many localities came to be known as inadvisable to settle in, the feeling persisting long after the cause was forgotten. People would look up at some of the neighbouring mountain-precipices with a shudder, even when not recalling how many settlers had been lost, and how many farmhouses burnt to ashes, on the lower slopes of those grim, green sentinels.