vi 
Contents 
Sample Eggs, Common Tern, Natural Size (In colours) to face p. 146 
Types of Mottling of Eggs of Common Tern . . „ 146 
Dr Maynard's Piebald Negro ,,193 
Pedigree of Cockayne's Piebald Family . . . „ 200 
Photographs of members of Cockayne's Piebald Family „ „ 
Plate VIII 
Plate IX. 
Plate X. 
Plate XI. 
Plate XIL 
Plate XIIL 
Plate XIV. 
Plate XV. „ 
Plate XVI. 
Plate XVII. Right forearm of a member of Cockayne's Piebald 
Family to show leucotic patches ...... 
Plate XVIII. Leucotic forehead, blaze and white hairs of eyebrow 
in a member of Cockayne's Piebald Family .... 
Plate XIX. Model of Skew Regression Surface giving mean Weight 
of Girls of Class B in Glasgow Schools for a given Height and 
Age 
Plate XX. Types of Finger-Prints ...... 
295 
422 
Corrigenda and Addenda, 
The following corrections and additions to the memoir on the Pai-tial Correlation Eatio, 
pp. 391 — 411, have been received from Mr L. Isserlis : 
Page 396. Eqn (28) for - read ^; Eqn (30) for r^y= read r^,= ■ Eqn (35) for — 
read — . 
Page 397. Eqn (37) for r^y= read r^^= ; Eqn (38) for cq-^ read cq^yi ; Line following 
Eqn (45) for d^-cy^y read d=—crxy; Eqn (46) for yzq^u read yiqxjf-; Line following 
Eqn (46) for ^Ri read ^^R^K 
Page 402. Line 8 from top : after, 
insert "provided the arrays of x for constant y are homoscedastic, or sufficiently so, for this 
to be an approximation." 
Line 6 from bottom for js'ip — i's^ read y3<p — yz6. 
Expression at foot of page, factor {rxyqxf-- qxhj) of first term in large curled bracket 
should read {rxyqx^ij-lxi/) and factor {r^^qx^y-ry^qxy) of expression in numerator of last line 
of same bracket should read ii'xzq^^y — ry^qxf). 
Page 403. lu denominator of second term of expression in first line /o?- \- yx^i^ read 1 -^'^y''- 
Page 405. In denominator of left-hand side of Eqn (70) for q^.,ji-r'^ read q^^y'i-r'^xv 
Page 406. Line below Eqn (71) and in Eqn (72) for read ^^^^ . 
1 + ''^x;/ XI/ 
