Part I., Definition of Resins in General--Definition of Balsams, and

especially the Gum Resins--External and Superficial Characteristics of Resinous Bodies--Distinction between Resinous Bodies and Fats and Oils--Origin, Occurrence and Collection of Resinous Substances--Classification--Chemical Constituents of Resinous Substances--Resinols--Resinot Annols--Behaviour of Resin Constituents towards the Cholesterine Reactions--Uses and Identification of Resins--Melting-point--Solvents--Acid Value--Saponification Value--Resin Value--Ester and Ether Values--Acetyl and Corbonyl Value--Methyl Value--Resin Acid--Systematic Resume of the Performance of the Acid and Saponification Value Tests.