There were no rats aboard the _Retriever_ when she left San Francisco. I recalled that the first night we tied up to the dock in Manila a dirty little China Coast tramp lay just ahead of us; and as I passed her on my way uptown I saw a rat run down her gangplank. She had rat-guards on her mooring lines. We had just tied up to the dock and I returned immediately and instructed the mate to be sure to put the rat-guards on our mooring lines, and not to use any sort of gangplank. When I returned to the vessel later that night I found that the mate had neglected to put on the rat-guards and logged him for it. Before we left the dock a Chinaman died of bubonic plague aboard that tramp, and the port health authorities put the vessel in quarantine immediately and prevented further spread of the disease.
When I saw the ship's cat with a rat, therefore, I knew we had some of that rotten China Coaster's plague rats aboard. Accordingly threw cat and rat overboard just as the cook announced Lindstrom's death. Upon looking up the information on plague, I am now convinced we have it aboard--that Linstrom died of it. First Mate Olaf Matson wrapped himself in my old bathrobe, gloved his hands and threw Lindstrom's body overboard, following it with the gloves and bathrobe.
I am, in a measure, prepared for plague. When I learned we had lain close to a vessel with a case of plague aboard I laid in some plague medicine, on general principles and just to have an anchor out to windward. At the English drug store on the Escolta I bought a tiny bottle of Yersin's Antipest Serum and another of Haffkine's Prophylactic Fluid. It was all they had on hand and it wasn't much; but--it is enough to save me--and I intend to be saved if possible. I cannot afford to die now. I do not know how old the Haffkine's Fluid is; and the older it is, the longer it takes to render one immune. The antipest serum will render me immune immediately, but the duration of the immunity thus granted lasts, at the most, only fifteen days. I must, therefore, first take a hypodermic injection of antipest serum to render me immune immediately and the next day follow with an injection of Haffkine's Fluid, which gives permanent immunity, but not for a week or longer when used alone.