The ordinary rise and fall is from 18 to 24 inches, with an increase of about a third at spring tides.

High water is later on the eastern than on the western coast; occurring, on full and new moon, a little after eleven o'clock at Adam's Bridge, about 1 o'clock at Colombo, and 1.25 at Galle, whilst it attains its greatest elevation between 5 and 6 o'clock in the harbour of Trincomalie.
_Red infusoria_ .-- On both sides of the island (but most frequently at Colombo), during the south-west monsoon, a broad expanse of the sea assumes a red tinge, considerably brighter than brick-dust; and this is confined to a space so distinct that a line seems to separate it from the green water which flows on either side.

Observing that the whole area changed its position without parting with any portion of its colouring, I had some of the water brought on shore, and, on examination with the microscope, it proved to be filled with _infusoria_, probably similar to those which have been noticed near the shores of South America, and whose abundance has imparted a name to the "Vermilion Sea" off the coast of California.
THE POPULATION OF CEYLON, of all races, was, in 1857, 1,697,975; but this was exclusive of the military and their families, both Europeans and Malays, which together amounted to 5,430; and also of aliens and other casual strangers, forming about 25,000 more.
The particulars are as follow:-- |Provinces |Whites.

|Coloured.

|Total.