But as I do not intend to write an essay on yellow fever, I will make an end, and get on shipboard as fast as I can, after stating one strong fact, authenticated to me by many unimpeachable witnesses. It is this; that this dreadful epidemic, or contagious fever--call it which you will, has never appeared, or been propagated at or beyond an altitude of 3000 feet above the level of the sea, although people seized with it on the hot sultry plains, and removed thither, have unquestionably died. In a country like Jamaica, with a range of lofty mountains, far exceeding this height, intersecting the island through nearly its whole length, might not Government, after satisfying themselves of the truth of the fact, improve on the hint? Might not a main-guard suffice in Kingston, for instance, while the regiments were in quarters half-way up the Liguanea Mountains, within twelve miles actual distance from the town, and within view of it, so that during the day, by a semaphore on the mountain, and another at the barrack of the outpost, a constant and instantaneous communication could be kept up, and, if need were, by lights in the night? The admiral, for instance, had a semaphore in the stationary flagship at Port Royal, which communicated with another at his Pen, or residence, near Kingston; and this again rattled off the information to the mountain retreat, where he occasionally retired to careen; and it is fitting to state also, that in all the mountain districts of Jamaica which I visited, there is abundance of excellent water and plenty of fuel. These matters are worth consideration, one would think; however, allons--it is no business of Tom Cringle’s. Speaking of telegraphing, I will relate an anecdote here, if you will wait until I mend my pen. I had landed at Greenwich wharf on duty--this was the nearest point of communication between Port Royal and the Admiral’s Pen--where, finding the flag lieutenant, he drove me up in his ketureen to lunch. While we were regaling ourselves, the old signalman came into the piazza, and with several most remarkable obeisances, gave us to know that there were flags hoisted on the signalmast, at the mountain settlement, of which he could make nothing, the uppermost was neither the interrogative, the affirmative, nor the negative, nor in fact any thing that with the book he could make sense of. “Odd enough,” said the lieutenant; “hand me the glass,” and he peered away for half a minute. “Confound me if I can make heads or tails of it either; there, Cringle, what do you think? How do you construe it?” I took the telescope. Uppermost there was hoisted on the signal mast a large tablecloth, not altogether immaculate, and under it a towel, as I guessed, for it was too opaque for bunting, and too white, although I could not affirm that it was fresh out of the fold either.