Had I told any one of my purpose, I should have had warnings and remonstrances enough. The few negroes who did not believe in alligators believed in sharks; the skeptics as to sharks were orthodox in respect to alligators; while those who rejected both had private prejudices as to snapping-turtles. The surgeon would have threatened intermittent fever, the first assistant rheumatism, and the second assistant congestive chills; non-swimmers would have predicted exhaustion, and swimmers cramp; and all this before coming within bullet-range of any hospitalities on the other shore. But I knew the folly of most alarms about reptiles and fishes; man's imagination peoples the water with many things which do not belong there, or prefer to keep out of his way, if they do; fevers and congestions were the surgeon's business, and I always kept people to their own department; cramp and exhaustion were dangers I could measure, as I had often done; bullets were a more substantial danger, and I must take the chance,--if a loon could dive at the flash, why not I? If I were once ashore, I should have to cope with the Rebels on their own ground, which they knew better than I; but the water was my ground, where I, too, had been at home from boyhood. I swam as swiftly and softly as I could, although it seemed as if water never had been so still before. It appeared impossible that anything uncanny should hide beneath that lovely mirror; and yet when some floating wisp of reeds suddenly coiled itself around my neck, or some unknown thing, drifting deeper, coldly touched my foot, it gave that undefinable sense of shudder which every swimmer knows, and which especially appeals to the imagination by night. Sometimes a slight sip of brackish water would enter my lips,--for I naturally tried to swim as low as possible,--and then would follow a slight gasping and contest against choking, such as seemed to me a perfect convulsion; for I suppose the tendency to choke and sneeze is always enhanced by the circumstance that one's life may depend on keeping still, just as yawning becomes irresistible where to yawn would be social ruin, and just as one is sure to sleep in church, if one sits in a conspicuous pew. At other times, some unguarded motion would create a splashing which seemed, in the tension of my senses, to be loud enough to be heard at Richmond, although it really mattered not, since there are fishes in those rivers which make as much noise on special occasions as if they were misguided young whales.