54 Mr. E. C. Snow. Correlations between Collaterals [June 3, 
Table X.—Mean Ancestral and Collateral Correlations in Man and Animals.* 
| 
= Parent aan Sibling. | Uncle. | Cousin. 
1111 E24 i PA et et 0-470 0°317 0°521 0 °265 O °267 
EROPSE se. fr ee ee eae 0 °522 0 *296 
ipasseb hound” 42.40.0.nceeee ee ene eee 0 °526 0 +220 O °508 
WGrreyhound perce teem esttnn sashes e 0:532 0°332 | 0-559 
WNhOrthornenncss ote: wee eae O °4.44, 0 *200 0 °530 
Neanlonbiometnionresulta ee 0-498 0 :273 0 +529 0 265 0-267 
| Gametic correlation on Mendelian 0 °500 0 °250 0 °500 0 °250 0 °250 
| hypothesis. 
| 
cousins, but this was ascribed to the incompleteness of the records. No 
general tendency in the direction of lower correlations for certain characters 
has yet been noticed in biometric investigations. 
(iii) The correlation between siblings is always greater than that between 
parent and offspring. This is in accordance with a priori expectation (see 
para. 3 above) and agrees with statistical results. 
(iv) The grandparental correlation is always the same as the avuncular. 
This also agrees fairly well with statistical conclusions. 
In his paper of last year Prof. Pearson drew attention to the fact that the 
* Each biometric correlation given in the table is the mean of a number of values and 
is compiled from the following sources :— 
P 
(1) Karl Pearson and Alice Lee, ‘On the Laws of Inheritance in Man,” Parts I and 
II, ‘ Biometrika,’ vols. 2 and 3. 
(2) Karl Pearson, ‘‘On Inheritance of the Mental and Moral Characters in Man,” 
ibid., vol. 3. ; 
(3) Amy Barrington, Alice Lee and Karl Pearson, “On Inheritance of Coat Colour in 
Greyhounds,” zbid., vol. 3. 
(4) Amy Barrington and Karl Pearson, “On Inheritance of Coat Colour in Cattle,” 
ibid., vol. 4. 
(5) Ethel M. Elderton, ‘‘On the Measure of the Resemblance of First Cousins,” 
‘Eugenics Laboratory Memoirs,’ IV, 1907. 
The characters correlated for man include stature, span, forearm and eye-colour. The 
sibling correlations include also hair-colour, together with those of no less than 
16 characters obtained from school records. The mean fraternal correlation based on this 
homogeneous material was 0°519. The cousin correlations were deduced from eye-colour, 
hair-colour, health, ability, etc. Among the animals, coat-colour was the character 
correlated throughout. 
