"Your Lordship is right," replied John Mangles; "but the fact is these sudden calms bring change of weather, and this is why I dread them. We are close on the trade winds, and if we get them ever so little in our teeth, it will delay us greatly."

"Well, John, what if it does? It will only make our voyage a little longer."

"Yes, if it does not bring a storm with it."

"Do you mean to say you think we are going to have bad weather?" replied Glenarvan, examining the sky, which from horizon to zenith seemed absolutely cloudless.

"I do," returned the captain. "I may say so to your Lordship, but I should not like to alarm Lady Glenarvan or Miss Grant."

"You are acting wisely; but what makes you uneasy?"

"Sure indications of a storm. Don't trust, my Lord, to the appearance of the sky. Nothing is more deceitful. For the last two days the barometer has been falling in a most ominous manner, and is now at 27 degrees. This is a warning I dare not neglect, for there is nothing I dread more than storms in the Southern Seas; I have had a taste of them already. The vapors which become condensed in the immense glaciers at the South Pole produce a current of air of extreme violence. This causes a struggle between the polar and equatorial winds, which results in cyclones, tornadoes, and all those multiplied varieties of tempest against which a ship is no match."