and the other Azores.  — 265 
ofthis bed:of pyrites, enables us: at once to account for all 
the phenomena in this spot, especially the sublimation of 
thesulphur, the heat of the water, and the chalybeate prop- 
erties of the springs. “We cannot but think however, that — 
although the pyrites may be and doubtless are active in pro- 
ducing these remarkable phenomena, ‘the cause is scarcely 
adequate to such continued and grand effects which must ° 
probably be ultimately referred to the general and deep 
seated cause of the volcanic activity which so signally distin-— 
guishes all the Azores. 
Chap. XIX. Contains an account of the chemical and - 
medical properties of the waters of these springs, from ° 
which it appears they contain Carbonic Acid, Carbonate of | 
Potash, Muriate of soda, Iron in the state of Carbonate—a ~ 
trace of manganese and silex. 
In an Appendix is given a general sketch of the remain-~ 
ing islands of this ha si is -very brief, and consists 
chiefly of the scattered facts collected by the autkor from 
different journals, travels, &c. He did not visit these islands ° 
and therefore does not pretend to give any thing more than | 
asketch of them. ‘There is in the Appendix a very inter- 
esting account ofan eruption in the island of St. George in 
1808, by J. B. Dabney, Esq. American Consul at Fayal.— 
‘Dr. Webster’s volume is neatly printed and is fully illus- 
trated by the following engravings executed in a correct and 
elegant style. Lice 
1. A general map of the Azores: 
2. A particular map of St. Michael. $281 
3. A scale of the Barometer and Thermometer at Ponts 
© Delgada, Oct. 1817 to March 1818. 
4. A view of the Eruption onthe N. W. coast of St. Mie’ 
» chael, June 13, 1811. 
ibe Appearance of the Island Sabrina, S.)2We:coneé mile 
» from St. Michael. 
6. View of Pico and St. George from Fayal - bs 
We have extracted so largely from Dr. Wiatisteh? S voleaie 
that the reader will now be able to form acompetent opinion’ 
for himself. But in closing this article we cheerfully add, ° 
that we have rarely perused a volume of equal extent which® 
has presented more valuable and interesting — ‘information 
conveyed in a chaste, unostentatious and perspicuous ° 
manner.The work is both popular and scientific; but rea- 
