480 



INDEX. 



Tunicates (Digestive, system of the), Vertebrates, superior (Lungs of the), 



160 

 Tunicates (Respiration of the), 232 



IT. 



UNITY of substance in the universe, 



3, 470 

 Urea, 138 



Urine (Composition of the), 268 

 (Formation of the), 267 



V. 



VASO-MOTORY nerves (Function of 



the), 216, 219 

 Vaso-motories (Their influence on the 



local temperatures), 453 

 Vegetals (Histological types), 45 



(Mineralisation of), 101, 283 



(Temperature of), 443 



Vertebrates (Digestive System of 



the), 163 



Vertebrates (Circulation of the), 199 

 -. (Respiration of the), 236 ZOOSPORES, 3] 5 



238 



Vertebrates (Muscles of the), 350 



(Sense of Smell in the), 



411 



(Formation of the Audi- 

 tory Organs), 417 



Vessels, .vegetal (Formation of the), 

 44 



Vessels, capillary (Classification of 

 the), 199 



Vesicle, germinative, 323 



Vestibule, auditory, 417 



Villosities, intestinal, 167 



Vitellus, 323 



Vitelline (Cells), 327 



W. 



WATER (Its proportion in the body of 



animals), 127 

 Water (Its office in assimilation), 127 



TH3 END. 



LONDON : R. CLAY, SONS, AND TAYLOR, PRINTERS. 



