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CONTENTS OF THE SECOND VOLUME.

PART XXXV.

TUNGSTEN.

Page

Natural history of tungsten...... 13

Properties of tungsten..... 14

Methods of obtaining tungsten...

Analysis of ores of tungsten... 16

PART XXXVI.

MOLYBDENA.

Natural history of molybdena-- 17

Properties of molybdena_ 18

Methods of obtaining molybdena.

Analysis of ores of molybdena.....- 19

PART XXXVII.

CHROME.

Natural history of chrome. .... 20

Properties of chrome_.......

Methods of obtaining chrome-- 21

Analysis of ores of chrome—... 22

PART XXXVIII.

COLUMBIUM.

Natural history of columbium......-- 23

Analysis of the ore of columbium_ 24