TABLE I. 
The Frequency of tiie Different Classes of Mentai. Condition in the Children of two Mentally Defective Parents ; together with 
the Mental Condition of the Grandparents, the Farents’ Sibs (Brothers and Sisters) and Other Blood Relatives about Whom 
Something is Known. 
Ifm nother n, mother; md, manic depressive insanity; mf, mothers father; mm, mother’s mother; N, normal; Ne, neurotic; np, neuropathic; obs, obesity: P, 
>n, pneumonia ; S, syphilitic ; sb, softening of the brain ; sc, scoliosis ; sd, senile dementia ; sh, shiftless ; sm, simple meningitis ; st, stillborn ; su, suicide ; ax, u 
f, typhoid fever; tu, tumour; va, varicose veins; ve, vertigo ; W, vagrant; ?, implies doubt; un, unclassified ; d, died.deaf; dau, daughter ; 
father’s father; fm, father’s 
ataxia; M, migrainous; 
, paralytic ; pa, paranoiac ; 
unchaste ; T, tuberculosis ; 
Serial Num­ ber.t d* 
Hbe'rel4 unChildren. N E F I MNe AP Sxffffm•a i s sibs. 
" rl* 
o, a 
Hbe'rel4 un N Ne np•3 111's other relatives. 
t d* 
-ibe'rel4 un N Ne npmmfHim•3 m’s sibs. 
| d* 
Hbe'rel4 un N Ne np•a m's other relatives 
* d* 
Hbe’rel4 un N Ne np 
136674..... 31 .........Edydy6.. 62321 I1E31 27611 ... 
24539164.. 31 ... 26 ............Eecc522 ...11515 ...E862 ...23617 
3IXa84i.. 21 .........EE22^2EshE1293023715... F2 
431624la.. 128.........A F CA C...5...2 ......3411• ••8 ...3»EAC FF Sx523« 
65861.. 1F...E Sxd-T10541 ...10622 
6284273.. 31 .........F32 ...J1033 ...EA2222 
7285731.. 11 .........FF CN?51 ...311 ,12422 ...E SxAN ?511... 2is11262414 ... 
8305461..... 23 .........FFF61 ...5<5750 ...11« 67Ed-TNe411 25849331 312? 
8( 4369 )61..... 14 .........F PA43 ...,1224119 ...317EI411... 219118 
( 2016 1 
JXII812.. 14 .........EAM512 ...2...17...15 ...2...F A SXAA M1051... 221616 
15412(i11.. 4A FA75 2■vi529 ...EAF13103 
1259781.. 7EAdy823 ...211290480 2EFE624115118413 16 
13597a72.. 32 .........F A...2...2 ............... ...Ed-dy12381 ......... 
141983a421... 1 ...EA Ne11 ...F Sx 
151334c?11 .........EEFA 
162234a3.. 21 .........d-P312 ...F 
17XXX a422.........FFAF 
IS128685.. 12.........F AF 
192105112CEdv...FA21 111 
VO30377l25.. 15 .........F ANN(i2.. 211F SxF Sx11 
2141723.. 1Fd-T21 ...1143 ...17FA421 190865588 40 
2233871341.. 25 .........1 ...Fd-P3...2 ......116115 ...FAdy8512 ......397302 ... 
23IX1232.. 25 .........FATHIF861 ......11220312 ...5E...E129.............3581242... 4 
241334b642.........F.................... ,,,F...ca42... 2 
251745a1 13.. 1 6«.........1 ...F.. * ...• ••FA.411 11720136l F 
1745b66.......FFFin3 ...|1fi22F 
275386a11.........FF4.. 12117F Sxd-P43120...o 
la. 
13146a922 ... 1 ......... 1 3...............I............. ...E 
218726... 3 ... 2 ... 1 ....................F«d-PP117... 3... I1299F Sx.............. 
346992... 4 1 2W................................A I531j2023... 18..........Ei.....................F2... .......... 
41006a31...................................... 2.........I3...2 ...l20...E51 ... 21212 
54078a2..................... 1 ... 1 ...............EEch3... 2l28573 371l24 622I 
NOTES.—1 A, 2 an encephalic. 81 is also C, Sx, and A, ‘1-E 2-F, 6 2 A, I Sx, 0 I E 2 F, 7 F, 8 1 A 2 P. 9 1 K IF 2 I 10 Sx. 11 1 A 2 P, 12 E, 18 1 Sx, A W, and 1 probably defective. 
“ all A and 1 C, 15 chorea, ^ traumatic, 17 a sib of f’s m in 4062a, 18 3-T, 19 1-C 1-1 20 I, 21 1 of these is the f in 1745b, 22 5 F I E. 88 M, 21 6 A, 
2S This child may be by a different father, 20 probably hysteroid epilepsy. * Includes all stillbirths and miscarriages,00 Weeks. Biology and Eugenics.