
The SciencesJuly 12, 1919
Platinum and Palladium in Brazil
Account and History of Neglected Occurrences of These Rare and Noble Metals

Platinum and Palladium in Brazil
Account and History of Neglected Occurrences of These Rare and Noble Metals

Professor Dr. Paul Walden, A 10,000-ton Motor-driven Ship

Precious Stones in 1904

Use of Diamonds in the Industries
Diamond Tools

Genesis of the Diamond

Facsimile of Dr. Joseph Priestley's Invoice on Coming to America in 1794

Precious Stones in the United States in 1901

Gem Fields of the World

Mineralogical Exhibit at the World's Fair

Agatized and Jasperized Wood of Arizona