INDEX 



291 



Velocity of nerve impulse, 78, 89, 



98, 213 



Venation of leaf, 44 

 Vestibule, the, 229 

 Vines, 4, 114, 132 

 Viola tricolor, glandular colleter 



from, 123 



Vision, persistence of, 221 

 Visual impulses, 222 et scq. 



purple, 223, 228 

 Volcanoes, 273 

 Volta, 50 

 Voltaic pile, 51 

 Voluntary muscle, 97, 99, 100, 144 



147 et seq., 165, 166, 184, 216 

 Voluntary muscle, nerve fibres of, 



150 

 Voluntary system, 86, 97, 216 



W 



WALLACE, 5 



Ward, 275 



Water in its relation to plant life, 38 



Wax in plants, 13 



Wheat, grain of, 113 



Womb, section of pregnant, 124 



Wundt, 155 



YELLOW fever, 275 



Z 



Zea mays. 121 

 Zygospore, 112 



