CHAPTER V.

RESINS AND BALSAMS.

Elementary constituents of resins; Division of resins; Hard resins; Soft resins or balsams; Gum-resins 155

Diffusion of resins in the vegetable kingdom; Benzoin 156

Varieties of benzoin and their characteristics 157

Peru balsam and mode of obtaining it 159

White Peru balsam 160

Characteristics of Peru balsam 161

Adulterants of Peru balsam and their detection 162

Tolu balsam and its characteristics 166

A new variety of Tolu balsam 167

Storax; Liquid storax and its characteristics 168

Adulteration of liquid storax and its detection 170

Storax in grains; Ordinary storax 171

American storax, white Peru balsam, white Indian balsam, or liquid-ambar; Myrrh 172

Myrrha electa and its characteristics 173

Constitution of myrrh 174

Adulteration of myrrh and its detection 175

Opopanax; Olibanum or frankincense 176

Commercial varieties of olibanum; Sandarac and its characteristics 177