XII. Researches on the tides.—eleventh series. On certain tide observations made in the Indian seas

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Certain series of tide observations, made at several places in the Indian Seas, having been forwarded to the Admiralty by the Honourable East India Company, I examined these by the assistance of Mr. D. Ross of the Hydrographer’s Office. The observations were very incomplete, as the following account of them will show. But as the tides of those seas offer some very curious phenomena, I endeavoured to dis­cover how far these phenomena were illustrated by the observations thus sent ; and I now lay the results of this examination before the Society, in order that they may be preserved, and combined with any information obtained hereafter from these seas. The places of observation were Coringa Bay, on the coast of Golconda . . Lat. N. 16° 49' Long. E. 82° 6' Cochin, on the Malabar coast . . . . . . 9 57½ 76 29 Surat Roads, in the Gulf of Cambay . . . 21 11 73 5½ Gogah, on the opposite side of the Gulf of Cambay . . . . . . . . . . . . . . . . . . . . . . . . . . .} 21 41 72 23 Bassadore, at the western extremity of the Island of Kismis, at the entrance of the Persian Gulf . . . . . . . . . . . . . . . . . . . . . . .} 26 39 55 32 1. At Cochin .—Although there are two years’ tides (1836,1837) for this place, still they are only taken once in twenty-four hours; and on examination of the heights they seldom vary more than one foot from spring to neap, but the range is only three feet.