Ever since I began to write upon this subject I have been sorely tempted to try and explain to shore readers what it is that the Board of Trade require of a man who presents himself before them as a candidate for a second mate's certificate. I have hitherto been deterred by the fear of being too technical, and yet I cannot help feeling that I ought to try. That feeling has grown so strong that I can no longer help making the attempt, knowing that every reader has his remedy if he finds that the subject bores him--he can skip the matter altogether. This seems to be the proper place to make the explanation if it is to be made, since it is the first certificate that a Merchant seaman is called upon to take--the threshold, as it were, of his career as an officer. May I, without suspicion of egotism, take a specific case, the one best known to me, my own? I had been at sea more than double the required time (four years) before I made any serious attempt to prepare for the examination. When I began, my arithmetic was very shaky, and of mathematics I was entirely innocent. My first step was to procure a handbook to the examinations, wherein all the problems were carefully worked out step by step. A "Norie's Epitome of Navigation," which contains all the necessary tables, and a blank book, comprised my educational outfit. I was at the time before the mast, in a comfortable iron barque sailing from New Zealand to Oregon, and thence home. We were a happy crew, young and lively, and the forecastle was, to put it mildly, not an ideal study. But the racket going on around me while I was wrestling with the unfamiliar mental exercises did me good in one direction--it helped me to concentrate my thoughts. I began at the very beginning, with decimal arithmetic, and worked at that until it led me naturally to the use of logarithms. Then I began to get interested, and the work was really a pleasure. Whenever I came to a dead wall I went and asked the mate for an explanation, and he, an amiable little Jerseyman, always did his best to enlighten me. My progress was slow, but fairly satisfactory; and when I shipped for my next voyage before the mast to China, I felt fairly certain that on my return I should be able to face the examiners without any dread of the result.