Page:Ballantyne--The Coral Island.djvu/142

 night, at twelve o'clock precisely, the tide is at the full; and at six o'clock every morning and evening it is ebb. I can speak with much confidence on this singular circumstance, as we took particular note of it, and never found it to alter. Of course I must admit we had to guess the hour of twelve midnight, and I think we could do this pretty correctly; but in regard to twelve noon we are quite positive, because we easily found the highest point that the sun reached in the sky by placing ourselves at a certain spot whence we observed the sharp summit of a cliff resting against the sky, just where the sun passed.

Jack and I were surprised that we had not noticed this the first few days of our residence here, and could only account for it by our being so much taken up with the more obvious wonders of our novel situation. I have since learned, however, that this want of observation is a sad and very common infirmity of human nature, there being hundreds of persons before whose eyes the most, wonderful things are passing every day, who nevertheless are totally ignorant of them. I therefore have to record my sympathy with such persons, and to recommend to them a course of conduct which I have now for a long time myself adopted,—namely, the habit of forcing my attention upon all things that go on around me, and of taking some degree of interest in them, whether I feel it naturally or not. I suggest this the more earnestly, though humbly, because I have very frequently come to know that my indifference to a thing has generally been caused by my ignorance in regard to it.

We had much serious conversation on this subject of the tides; and Jack told us, in his own quiet, philosophical way, that these tides did great good to the world in