PART I

Page Introductory 6

Alchemy 7

Modern Chemistry 8

Mediæval Chemistry 10

John Dalton 13

The Atomic Theory 14

The Elements 15

Atomic Weights 16

Valency 17

The Periodic Law 18

Earlier Discoveries 20

Analysis and Synthesis 21

Formulæ and Equations 22

Organic _vs._ Inorganic Chemistry 23

Organic Compounds 25

Catalysis 26

Enzymes 27

Hormones 27

Chemistry of the Earth 28

The Spectroscope 29

Astro-Physics and Chemistry 31

Spectrum Analysis 31

Industrial Chemistry 33

Instruments of Research 36

Salinity of the Oceans 37

The Newer Chemistry 38

Radio-Activity 39

Intra-Atomic Energy 39

The Electrical Theory of Matter 40

Within the Atom 42

Electrons 43

The Nature of Matter 44