up another lettuce; and if you go up its creek eighteen months or so after, with a little launch, it goes and winds those roots round your propeller. The fierce current of the wet season, when the main river scours into the creeks, and the creeks start fierce currents of their own with their increased waters, play great havoc with these lettuce beds, and plots of them get cut off from the main bodies. These plots float off down river, and as soon as they get into a bit of slack water or hitch on a rising sandbank, they collect all other floating things that come their way and start as islands. The grass soon chokes off its companion the lettuce, and makes the island habitable for other plants; and so you have a floating island. These floating islands have a weird fascination, and I never saw so many of them in any river as in the Ogowé. To see a bit of seeming solid land, solemnly going past you down the river, as if it were out on business; or if it is in tidal ways and you on a fixed point, to see it coming up to you, hanging about, and then retiring, is unsettling to one's general ideas of the propriety of nature. One of the largest of these floating islands I saw, was in the Karkola River. It had got caught in an eddy made by another stream entering this river, and it kept swimming round and round slowly and quietly.
I have not here given an account of half the difficulties of navigating a tropical river in the forest-region, because they are so numerous, and so many of them not to be guarded against. Those logs which from their specific gravity float down just under water and strike you unexpectedly; and even those logs that float on the surface, are nasty things to meet on an ink-black night. I well remember the miscellaneous joys we happened on once when dropping down the Ogowé in the dark in a small canoe. Half the way it was a steeplechase for the canoe over floating logs. Sometimes she refused her fences point-blank and butted them; sometimes she would climb up them and fall over on the other side; and even my experienced native companion owned that it was difficult to tell, during the subsequent aquatic sports which her crew indulged in, which was the bottom of the canoe and which was the unsophisticated log. Sometimes she would clear her log-fence at a bound in a showy way, but then when she came down the other side, she went too deep and filled herself and
