"So far, we're making delightful progress," said Croyden; "but there are breakers ahead when Hook-nose and his partner get in the game. Suppose we inspect the premises and see if they have been here in our absence." They went first to the place where they had seen them conceal the tools--these were gone; proof that the thieves had paid a second visit to the Point. But, search as they might, no evidence of work was disclosed. "What does it mean?" said Croyden. "Have they abandoned the quest?" "Not very likely," replied Macloud, "with half a million at stake. They probably are seeking information; when they have it, we shall see them back again." "Suppose they bring four or five others to help them?" "They won't--never fear!--they're not sharing the treasure with any one else. Rather, they will knife each other for it. Honor among thieves is like the Phoenix--it doesn't exist." "If the knifing business were to occur before the finding, it would help some!" laughed Croyden. "Meantime, I'm going to look at the ruins of the light-house. I discovered in an almanac I found in the hotel last night, that the original light-house was erected on Greenberry Point in 1818. This fact may help us a lot." They went out to the extreme edge, and stood gazing across the shoals toward the ruins. "What do you make the distance from the land?" Croyden asked. "About one hundred yards--but it's very difficult to estimate over water. It may be two hundred for all I can tell." "It is exactly three hundred and twenty-two feet from the Point to the near side of the ruins," said Croyden. "Why not three hundred and twenty-two and a half feet!" scoffed Macloud. "I measured it this morning while you were dawdling over your breakfast," answered Croyden. "Hitched a line to the land and waded out, I suppose." "Not exactly; I measured it on the Government map of the Harbor. It gives the distance as three hundred and twenty-two feet, in plain figures." "I said you had a great head!" Macloud exclaimed. "Now, what's the rest of the figures--or haven't you worked it out?" Croyden drew out a paper. "The calculation is of value only on the assumption--which, however, is altogether reasonable--that the light-house, when erected, stood on the tip of the Point. It is now three hundred and twenty-two feet in water. Therefore, dividing ninety-two--the number of years since erection--into three hundred and twenty-two, gives the average yearly encroachment of the Bay as three and a half feet. Parmenter buried the casket in 1720, just a hundred and ninety years ago; so, multiplying a hundred and ninety by three and a half feet gives six hundred and sixty-five feet. In other words, the Point, in 1720, projected six hundred and sixty-five feet further out in the Bay than it does to-day." "Then, with the point moved in six hundred and sixty-five feet Parmenter's beeches should be only eighty-five feet from the shore line, instead of seven hundred and fifty!" Macloud reflected.