There, running down the moon-lit road the boys saw a big white mule, to the neck of which was fastened a chain that rattled with every step.
“There’s the ghost,” said the professor. “I thought I recognized the voice as that of a quadruped with which I was familiar. The animal has probably broken loose from the field and came here in search of food.”
“Well it certainly scared me all right,” admitted Bob. The others did not commit themselves, but there was no doubt but that they had several heart-flutters.
“I wonder what that crash was?” asked Ned.
The professor glanced down the hole leading to the first floor.
“The ghost made it by kicking our ladder away,” the scientist replied. “I wonder how we can get down.”
But the boys did not worry about this, being too sleepy. Soon they were all snoring again, and did not awaken until the sun was streaming in the window.