ON MATTER AND FORCE. 65 



LECTUKE III. 



ON THE THIRD STAGE OF OUR IDEAS REGARDING THE 

 UNION OF PONDERABLE MATTER AND FORCE IN THE 

 BIOLOGICAL SCIENCES. 



ME.' PRESIDENT, 



I come now to the object for which I 

 undertook this course of lectures. 



It is to show you that, even in this country 

 in which John Hunter's great authority makes 

 the materia mice diffusa a reality, and I might 

 almost say a part of the religio medici, yet even 

 here, the third stage of ideas regarding the 

 union of ponderable matter and force is be- 

 ginning to grow up amongst us, and gives the 

 promise of fruit far beyond any we have 

 hitherto gathered in physiology, pathology, 

 and therapeutics. 



The general ideas regarding the union of 



F 



