CONTENTS. Xlll

Page

Frankland’s theory respecting lunar oceans ... ... ... 349

Glacier action ... ... ... ... ... ... ... 350

Mattieu Williams’s theory of crater-formation (note) ... 354

Mallet’s theory of contraction of crust upon nucleus ... 362

The radiations from Tycho, &c. ... ... ... ... 371

Mr. Birt’s photometric researches . ... ... 374

Detailed examination of the moon’s surface required ... 378

Real changes must he taking place ... . 379

TABLES.

Index to the Map of the Moon .

Table I.—Grey plains, usually called seas . 383

Table II.—Craters, mountains, and other objects, num-bered as in Webb’s Chart. ib.

Table III.—The same alphabetically arranged . 388

Table IV.—Lunar elements.393