134 Scientific Intelligence. 
Speaking of the enlargement of the work and the changesiie : 
undergone, Prof. Dana observes that “not a page and 7 : 
paragraph of the preceding edition remains unaltered, and fulliiye — 
sixths of the volume have been printed from nana 
baring b been aero Oy) 
_ The preface closes with the announcement (as a sequel to t 
statement that the work had been posted up, as far as was : 
to the date of publication) that “a series of Spa pe 
Supplements as they are issued struck off, that they may be ae 
sible to all who have copies of the mineralogy. 
The pee and SG ginal of Gold and Silver; 
Arruur Puarurs, Mining Engineer. London, E. & J. N. Spo : 
48 Charing Cian, 1864. 8vo, pp. 532.—This treatise qe a 
. 
aed exhibits fale the present state 6f ape 
paar and practical, relating to the subjects dise 
first describes the princ ipal gold and. cleo i 
accompanied by such statistical informat 
ara a their yield and importance; mi follows mf 
accessible to Enalish readers ally true 
erican tfornia of ioe ike 
ean in California and y ira eee ~_ 
nia, Brazil and ustralia, panie ' 
and plates. A particularl resting account 0 gi 
mines ( y called Seg ate 1 Rey) rd of the: : 
