CHAPTER XVI

--THE PHYSICAL CHEMISTRY OF PROTOPLASM

Heterogeneous structure of protoplasm; protoplasm a colloidal gel; water; salts; osmotic pressure; surface boundary phenomena; electrical phenomena; acidity and alkalinity; summary; vital phenomena as chemical and physical changes; references 221-238

## CHAPTER XVII --HORMONES, AUXIMONES, VITAMINES, AND TOXINS

External and internal stimulants; hormones; vitamines; auximones, toxins 239-248

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