In writing the following paper, the author has taken full advantage of the various publications dealing with the subject, and desires to mention the progress reports of the New Zealand Geological Survey (Sir Jas. Hector, K.C.M.G., E.R.S., Director); the "Geology of Otago," by Profs. Hutton and Ulrich, and several papers in the Transactions of the New Zealand Institute.

Eor convenience of reference, the subject is divided as follows:—

I.	Introduction and sketch of geological structure.
II.	Economic geology. 1. Soil. 2. Coal and oil shales. 3. Sand. 4. Clays. 5. Building and ornamental stones, including cements. 6. Gold.
III.	Minerals.
IV.	Appendix.