and the other Azores. 265 
of this bed of pyrites, enables us at once to account for all 
the phenomena in this spot, especially the sublimation of 
the sulphur, the heat of the water, and the chalybeate p 
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 tt activity which so signally distin- 
guishes all the Azore 
Chap. XIX. Conteis an account of the age and 
medical properties of the waters of these springs, from 
which it appears they contain Carbonic Acid, Gabbokite of 
Potash, Muriate of soda, Iron in the state of cena 
trace of manganese and silex. 
Tn an Appendix is given a general sketclr of the re itial= 
ing islands of this group—it is very brief, and Consists 
chiefly of the scattered facts collected by the author 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 of an 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 —_ illus- 
trated by the following engravings executed in a corre 
elegant style. 
1A general map of the Azores. 
2. A particular map of St. Michael. 
3. A a of the Barometer and Thermometer at Paine 
gada, Oct. 1817 to March 1818. 
4. An view of the Eruption on the N. W. coast of a Mi 
chael, June 13, 1811. 
e of the Jaand Sabrina, S. W. one mile 
‘fvciem St. Michael. 
6. View of Pico and St. —— from Fayal. 
We have extracted solargely from Dr. Webster’s volume 
conveyed in a = ci anostentatious and perspicuous 
. The work is both popular and scientific ; but rea- 
