page 195 note * They are far less important now, however, than formerly. The artificial sulphate of soda manufactured in large quantities from common salt for the use of the glass makers, the artificial production of carbonate of soda, &c., have greatly diminished in value the natural deposits.—T. L. P.

page 197 note * Our readers should refer to Sir C. Lyoll's “Memoir on the Tertiary Formations of Belgium,” in the Journ. Geol. Soc., vol viii, for details of the structure and paleontology of that country, and for references to other authors and geologists who have treated of the same subject.—Ed. Geologist.

^{page 197 note †} See Lyell's Memoirs, op cit. p. 344 and pl. 19, for an account and figures of these palm-nuts, allied to those of the Nipa.—Ed. Geologist.

page 198 note * See Forbes' and Hanley's “British Molluscs” for a good account of the Teredo.—Ed. Geologist.

^{note 198 note †} In the Province of Brabant, we have two or three other fossil species of the same genus.—T.L.P.

page 200 note * Whilst writing the above, the following passage of Humbolt's is irresistibly called to mind:—“When the needle, by a sudden disturbance in its horary course, indicates the presence of a magnetic storm, we are still unfortunately ignorant whether the seat of the disturbing cause is to be sought in the earth itself or in the upper regions of the atmosphere.” (Cosmos, vol. I.)—T.L.P.

page 201 note * Consult on this question, Grove's “Correlation of Physical Forces.”—Ed. Geol.

page 203 note * In the second volume of the new edition of Mantell's “Wonders of Geology,” just published, our readers will find an ample résumé of microscopical researches in the structure of coal, and a notice of the experiments by Goeppert and others, in illustration of the nature of coal.—Ed. Geologist.