Our chief object in coming here was to see the slate quarries at Penrhyn.  They are of enormous extent, and not less than three thousand men and boys are employed in them, whose wages amount to upwards of 2000 pounds per week; and it is calculated that upwards of 11,000 people, including wives and children, find subsistence from working these quarries.  A railway conveys the slate about six miles, to the shores of the Menai Straits; and upwards of 70,000 tons of slate are annually exported, the income derived from them being 250,000 pounds per annum. They are the property of the noble owner of the magnificent Penrhyn Castle.