Emulation,

165-166

End-brush of an axon,

33-36, 38, 61

Endocrine glands,

122-123, 554

Energy,

conservation of, 40;
dammed-up, 82-84, 301, 309, 393;
released, 535-546;
stored, 40-41, 46

Envy,

166, 168