where necessary. The constants resulting from this analysis are given in column (1), while those for Port Chalmers, which is eight miles lower down the harbour, are given in column (2).

The constants for Dunedin have been checked by computing from them the heights of the tide on different days, and comparing the values with the gauge-records. The results have shown that the constants have been determined correctly.

And in order to show the characteristic features of the New Zealand tides a comparative schedule is given—(I) comparing the various component tides with the chief lunar tide M₂ = 1, and (II) comparing the diurnal tides with the K₁ tide = 1; and for comparison with Australia the component tides for Adelaide, Melbourne, and Sydney are also shown.

In New Zealand the N₂ tide ranks next the M₂ in amplitude, with the S₂ tide third both at Dunedin and Auckland; while at Wellington the S₂ tide is sixth, being smaller than the long-period tides MSf and Mm, and the short-period tides M₂, N₂, and ν₂.

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(1.) New Zealand Tidal Survey: Report of Department of Lands and Survey, Wellington, for 1913–14.—Hourly ordinates for one year beginning 1911, July 1.

(2.) Thomas Wright, Proc. Roy. Soc., London, A. Vol. 83, p. 127: Harmonic Tidal Constants for certain Chinese and New Zealand Ports.—Hourly ordinates for the year 1901.