CHAPTER XIV. THE MEASURE OF THE GRANITE WALL—AN APPLICATION OF THE THEOREM OF SIMILAR TRIANGLES—THE LATITUDE OF THE ISLAND—AN EXCURSION TO THE NORTH—AN OYSTER-BED—PLANS FOR THE FUTURE—THE SUN’S PASSAGE OF THE MERIDIAN—THE CO-ORDINATES OF LINCOLN ISLAND. At daybreak the next day, Easter Sunday, the colonists left the Chimneys and went to wash their linen and clean their clothing. The engineer intended to make some soap as soon as he could obtain some soda or potash and grease or oil. The important question of renewing their wardrobes would be considered in due time. At present they were strong, and able to stand hard wear for at least six months longer. But everything depended on the situation of the island as regarded inhabited countries, and that would be determined this day, providing