OTHER PHYSIOLOGISTS. 593 



and endowed with vitality, before any part of the 

 nervous system, consequently, that the latter 

 must be a secondary effect or product of the or- 

 ganizing principle : 3. That the aggregate vital 

 energy of animals is directly in proportion to the 

 quantity of their respiration, or of caloric that 

 passes through their tissues, and bears no uniform 

 relation to the developement of the brain and 

 nerves : 4. That the nervous system, like all the 

 other organs, is formed from and vitalized by the 

 blood, which is formed in the lungs, by the same 

 active principle that causes the seeds of plants to 

 germinate, and the germs of animals to unfold 

 from a simple albuminous mass, into highly or- 

 ganized bodies. 



Yet we are told by Tiedemann, " that the deve- 

 lopement of the locomotive organs is in propor- 

 tion to that of the nervous system." (Compar. Phy- 

 siology, p. 182.) And Mr. Mayo says, that " the 

 nervous system determines the rate at which each 

 function proceeds, the quantity of secretion, and 

 the frequency of involuntary motion." (Outlines 

 of Physiology, p. 264.) Again ; Magendie ob- 

 serves, that " we are totally ignorant in regard to 

 the cause of muscular motion, but must seek for 

 the impulse which sets our various tissues in mo- 

 tion, in the nervous system." (Lectures on the 

 Nerv. System.) Dr. Edwards also maintains, that 

 "the predominance of the nervous system in warm 

 blooded animals, renders all parts of the body 



