Full text: Problems in eugenics

F. W. Mott.Medicine and Eugenics.423 
Statistical Data Relating to Inheritance and Insanity, especially in Relation 
to Anticipation. 
Six months ago data referring to 508 pairs of parent and offspring had 
been collected from the records of 464 insane parents whose 500 insane 
offspring have been also resident in the London County Asylums, and in 
these the age of the first attack has been ascertained. 
Direct Heredity. 
The following table is compiled from 217 pairs of father and offspring 
and 291 pairs of mother and offspring. The figures denote the percentage 
of cases whose first attack occurred within the given age periods. 
Table I. 
Age Periods.Father.Offspring.Mother.Offspring 
Under 20 years...I‘426-2o-627-8 
20-24 ,, ...0-4i8-o3'4157 * «s 
25-29 „ ...1'418*04’418*2 0 c 
30-34 ,» ••9-61307-813-4 
35-39 » •••11 57-39-210-o 
40-44 ,, ...9-26-410-35‘8 
45-49 »14-36'o12*0~ TO O 
50-54 »» •••17-509I2'32-4 1.2 '5 
55-59 » •••13-837i4-oj .j 1—1 O-i 
60-64 >> •••IO'I—XX-6i'3 
65-69 ,, ...5'°—8-8— 
70-74 ,, ...4-6°'43'1— 
75-79 „ •••0-4—•i'3— 
80 ,, ......0-4—06— 
This table is represented graphically in the subjoined Figs. 16 and 17, 
the abscissae representing the age periods and the ordinates the percentage 
of cases whose age at the time of first attack falls within the given periods.

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