CONTENTS. 
vn 
Page 
Fluor Spar .... 
9 
375 
Diamond ..... 
380 
Ruby ..... 
393 
Emerald ..... 
398 
Garnet ..... 
402 
Opal ..... 
405 
Hydrophane .... 
409 
Agate ..... 
413 
Granite ..... 
424 
Salt . . . ... 
429 
Nitre ..... 
445 
Bitumen ..... 
452 
Coal ..... 
4bO 
Black Lead .... 
471 
Amber ..... 
47 b 
Gold ..... 
480 
Platina ..... 
488 
Silver ..... 
492 
Copper ..... 
501 
Iron . . . ... 
516 
Tin '..... 
527 
Lead ..... 
537 
Mercury 
549 
Basaltes ..... 
561 
