6 9 



we have hitherto defined as physiological and psychologi- 

 cal may be further subdivided into temperament, idiosyn- 

 crasy, diathesis, and hereditary predisposition : the first 

 " applicable to the sum of the physical peculiarities of an 

 individual, exclusive of all definite tendencies to disease ; " 

 the second, "a peculiarity of an individual, usually rare, 

 which does not necessarily entail any degree of proclivity 

 to disease, but which may become obvious under a variety 

 of exciting causes ; " the third, *' a bodily condition, how- 

 ever induced, in virtue of which the individual is, through 

 a long period, or usually through the whole life, prone to 

 suffer from some peculiar type of disease ; " x and the last, 

 any varieties of the three former when transmitted from 

 parents to children. 



The following table will show at a glance the various 

 factors of individuality, which characterise every individual 

 in different degrees : 



Ancestral .. Qualities physical, mental, or moral ^ 



Parental ... Qualities physical, mental, and moral V Inherited. 



Maternal ... Qualities generated during uterine life J 



Modifications effected by natural variability... Inherited, 

 /Temperament ... ... \ 



Ancestral and ' Idiosyncrasy ... ... > Inherited. 



Parental. "j Hereditary predisposition... / 



N Diathesis ... Inherited or acquired. 



Modifications effected by his environment \ . , 

 during the life-long struggle for existence / 



When it is remembered that every individual is subjected 

 to each and all of the foregoing influences, and that each, 

 one of us has inherited certain peculiarities physiological, 

 psychological, and pathological which we, in turn, shall 

 pass on to our descendants, the reason is not far to seek as 

 to why every individual differs from every other, or why those 



1 Mr. Jonathan Hutchinson. 



