480 



INDEX. 



Tunicates (Digestive, system of the), 



160 

 Tunicates (Respiration of the), 232 



U. 



Unity of substance in the universe, 



3, 470 

 Urea, 138 



Urine (Composition of the), 368 

 (Formation of the), 267 



Vaso-motort 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 (Circnlation of the), 199 

 rr (Pespiration of the), 236 



Vertebrates, superior (Lungs of the), 



238 

 Vertebrates (Muscles of the), 350 



■ (Sense of Smell in the). 



- (Formation of the Audi- 



411 



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 

 ViteHine (Cells), 327 



W. 



Water (Its proportion in the body of 



animals), 127 

 Water (Its office in assimilation), 127 



ZOOSPDEES, 315 



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



