GULF of CAMBAY is about 72 miles long, 30 miles wide at its mouth, and 14 miles at its head. The Nerbadda and the Tapti rivers disembogue into it ; and the smaller rivers are the Sabarmati, hye, and Dhardur. The mass of alluvial matter brought down by these rivers, and the peculiar action of the tides, has thrown up many enormous sand ba.nks ; the flood-waves come in the form of a bore. At Perim, 26 miles from the entrance of the gulf, the tidal stream is forced through a space four times less than it occupied before ; and again, 27 miles farther north, below tho Bore Rocks, it flows into a channel only one-ninth its original width, from which circumstances the velocity of the tide is greatly increased. At the head of the gulf, where it separates into the channels of the Mhye river and the Cambay Creek to the east, and into those of the Sabatmati on the north-east, the accumu latod waters of the flood-wave assume the form of a bore, the wave coming in perpendicularly. The eastern or principal bore rises five miles to the W.S.W. of Cambay Creek, and is not perceptible in the neap tides, unless the previous springs have been unusually high, when it may be observed slightly through tho quarter. It generally com mences when the winds begin to lift, the waves increasing daily in height as the tides gain strength, and it is at its greatest height about two days after new and full moon. It also varies with the
night and day tide, which differ in height six or eight feet, the night tide both of new and full moon being the highest ; as the highest tide must have the greatest velocity, so the wave of the bore will be highest with the greatest tide. At about 14 miles below Cambay, the high springs were found to rise 33 feet. And the flood runs at six miles and the ebb at seven miles an hour. The bore first shows itself in the channel at eight miles below Cambay, as a wave 3f feet high, with a rate of seven knots. In the first hour the water rose six feet during the first ten minutes. Above Cara bay the wave breasts in seven feet high, with a velocity of ten knots. The western bore, running into the Sabarmati river, is almost precisely similar to the eastern bore, but it washes away by its force very large portions of the shore and adjoining sandbanks. In places where the force of the wave is directod to one point, it frequently llowS quite perpendicularly, having the appear ance of a wall, when it curls and breaks with a thundering roar. In the centre of the channel in the main line of the rush of the bore there is less danger than near the shore, where the wave curls along the banka—Find/ay.