I must have slept for a long time. I was only wakened when I had reached the last light sleep which dissolves of itself, and it must have been very light, for it was an almost inaudible whistling noise that wakened me. I recognized what it was immediately; the small fry, whom I had allowed far too much latitude, had burrowed a new channel somewhere during my absence, this channel must have chanced to intersect an older one, the air was caught there, and that produced the whistling noise. What an indefatigably busy lot these small fry are, and what a nuisance their diligence can be! First I shall have to listen at the walls of my passages and locate the place of disturbance by experimental excavations, and only then will I be able to get rid of the noise. However, this new channel may be quite welcome as a further means of ventilation, if it can be fitted into the plan of the burrow. But after this I shall keep a much sharper eye on the small fry than I used to; I shall spare none of them.