1822.] : New Scientific Books. 397 
The pyroxene yielded 
Silica... .... 0... swaeowe.haald on 50°33 
Protoxide of iron ..........0.5. 20°40 
Lime ys2agyeeh itn.l WOe.1 19°33 
Magnesian bony. biel ani! . Joan 6°83 
Adumintnens9Q. ta spa loWwstawe 1°53 
Water...... sip Meee) SP 0°66 
99:08 
A trace of oxide of manganese and 
hd PES 3a axa w0%) bin’ be ave embers 6 MOP 
“100: 00 
(Silliman’s Journal.) 
VIII. Death of Dr. Marcet. 
We lament to state the demise of Dr. Marcet, that took place on 
Saturday, Oct. 19. His chemical researches were chiefly detailed in 
the Transactions of the Royal Society, of which he was an active 
member. His principal work is a treatise on Calculi, a book of esta- 
blished reputation, and displaying the minute accuracy with which all 
that he performed is replete. He was in the 52d year of his age, and 
was about to return to Geneva, his native country. 
IX. Death of Mr. James Sowerby. 
It is with great regret also that we have to announce the death of 
this gentleman which occurred on Oct. 25, after a long and severe 
illness. Mr. Sowerby was a Fellow of the Linnean Society of Lon- 
don, Member of the Geological Society, Honorary Member of the 
Physical Society of Gottingen, &c. &c. ‘His patient and indefatigable 
labours in several branches of natural history are well known to the 
scientific world ; and he contributed in various ways to the advance- 
ment of natural ‘knowledge. 
ARTICLE XV. 
NEW SCIENTIFIC BOOKS 
PREPARING FOR PUBLICATION, 
The Life and Remains of the late Dr. Edward Daniel Clarke, Pro- 
fessor of Mineralogy in the University of Cambridge. 
A Quarto Volume, with Engravings, will shortly appear, giving an 
Account of Don Antonio del Rio’s Discovery ofan ancient City in the 
Kingdom of Guatimala, North America. 
JUST PUBLISHED, 
A Treatise on the Foot-rot in Sheep, including Remarks on the 
exciting Cause, Method of Cure, and Means of preventing that 
