[Illustration]




Scientific American Supplement No. 458




NEW YORK, OCTOBER 11, 1884

Scientific American Supplement. Vol. XVIII, No. 458.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.



TABLE OF CONTENTS.

I. CHEMISTRY AND METALLURGY.--Chemical Nature of Starch
Grains.

The Amalgamation of Silver Ores.--Description of the Francke
tina, or vat process for amalgamation of silver ores.--By E.P.
RATHBONE.--6 figures.