9O THE FEEBLY INHIBITED. 



factor, even though simplex. The case of 820, IV~4, who is stated to 

 be even-tempered and well-poised (despite the extreme excitement of 

 Ms mother), is exceptional; but this result will occasionally appear 

 when the hyperkinetic parent, though very excited, is actually simplex. 

 I have let the case stand in this class in order to avoid the charge of 

 manipulation to make observations agree with expectation. 



Classes 7 to 10 offer no special difficulties. In class n, mating 2 a 

 demands consideration. The eldest son (III-i) of a maniacal mother, 

 is less excited than she, but still so excitable as to threaten suicide; so 

 he is charted and tabulated as being duplex in the exciting factor, 

 doubtless the complete dominance of the single dose. However, in 

 this fraternity are 2 other individuals that have to be recorded as 

 normal. III-3, who is " cordial and cooperating;" III-n, who is 

 "thrifty, sociable, and kindly;" and possibly 1 1 1-9, who is recorded as 

 good-natured, pleasant, and generous, but these adjectives suggest a 

 rather expansive temperament. Rather than to force the first two 

 cases into the nervous group (to which by hypothesis they belong), they 

 are recorded as (exceptionally) normal individuals. 



In class 12 we have probable complete dominance of the simplex 

 condition; but also a normal person, "calm, dignified, and reserved," 

 when none is expected. 



In class 14 the son of a manic-depressive is "temperate, agreeable, 

 pleasant, and kind." This son is still young and his mother first 

 showed her traits in exaggerated form relatively late in life. This 

 may be only an apparent exception. 



Class 2 1 is the largest of all except class 24. The relation of observed 

 and expected is fairly close in most of the divisions, except that there 

 is a striking deficiency of the cholerics and a corresponding excess of 

 the normals and the manic-depressed. Some, if not all of these devi- 

 ations from expectation may be chance. In class 24 the relations are 

 fairly close. 



To sum up, out of 629 offspring we have 6 normals recorded where 

 they are not expected by hypothesis. All other exceptions (5) are 

 of the order of complete dominance of a simplex determiner for excite- 

 ment. The proportion of non-conformable cases is thus 0.95 per cent. 

 It seems to me that a hypothesis that fits the facts so closely has a 

 very high degree of probability in its favor. At any rate, it meets 

 the pragmatic test; it works! Actually, of the 133 offspring of a 

 manic parent all are excitable except the 6 normals. When neither 

 parent is excitable none of the children are excitable (classes 28 and 29, 

 1 8 offspring, 12 more or less depressed). When neither parent shows 

 depression the children rarely do (classes i, 2, 5, 8, 15, and 18; 52 chil- 

 dren). When one parent shows melancholia and the other carries no 

 depression, then none of the children suffer from melancholia (classes 4, 

 7, 17, 20, and 26; 21 offspring). While we may grant that the number 



