"If I may be allowed to express myself allegorically with regard to our intellectual operations, I would say that the mind chooses for itself some little spot or district, where it erects a dwelling, which it furnishes and decorates with the various materials it collects. Of many apartments contained in it, there is one to which it is most partial, where it chiefly reposes, and where it sometimes indulges its visionary fancies. At the same time, it employs itself in cultivating the surrounding grounds, raising little articles for intellectual traffic with its neighbours, or perhaps some produce worthy to be deposited amongst the general stores of human knowledge. Thus my mind rests at peace in thinking on the subject of life, as it has been taught by Mr. Hunter; and I am visionary enough to imagine that if these opinions should become so established as to be generally admitted by philosophers, that if they once saw reason to believe that life was something of an invisible and active nature _superadded_ to organization, they would then see equal reason to believe that mind might be superadded to life, as life is to structure. They would then, indeed, still further perceive how mind and matter might reciprocally operate on each other by means of an intervening substance. Thus, even, would physiological researches enforce the belief which I say is natural to man: that, in addition to his bodily frame, he possesses a sensitive, intelligent, and _independent_ mind—an opinion which tends in an eminent degree to produce virtuous, honourable, and useful actions[45]." ATTRACTIONS OF PhYSIOLOGY—THE NECESSITY OF EXAMINING BOTH HEALTH AND DISEASE A VERY IMPORTANT POINT JUST NOW, AS TESTING THE VALIDITY OF CERTAIN VIEWS OF LIEBIG AND OTHERS. "No study can surely be so interesting as Physiology. Whilst other sciences carry us abroad in search of objects, in this we are engaged at home, and on concerns highly important to us, in inquiring into the means by which 'we live, and move, and have our being.' To those, however, engaged in the practice of Medicine, the study of Physiology is indispensable; for it is evident that the nature of the disordered actions of parts or organs can never be understood or judiciously counteracted, unless the nature of their healthy actions be previously known.