CONTENTS 
{All Rights reserved) 
PAGE 
I. The Probable Error of a Mean. (With Four Diagrams in the/ text,) 
By " Student " 1 
II. Split-Hand and Split- Foot Deformities, their Types, Origin and Trans- 
mission. (With Plates I— VII and Two Diagrams in the text.) 
By Thomas Lewis, M.D., and Dennis Embleton . . . ,26 
III. On the Generalised Probable Error in Multiple Normal Correlation. 
(With Two Diagrams in the text.) By Karl Pearson, F.R.S., and 
Alice Lee, D.Sc. , . . '. . . . " . . • . 59 
IV. On Inheritance of the Deformity known as Split-Foot or Lobster-Claw, 
(With Plates VIII— XVI.) By KaRl Pearson, F.R.S. . , . 69 
V. On a Determinantal Theory of Inheritance, from Notes and Sugges- 
tions by the late W. F. R. Weldon. By K. Pearson ... 80 
Miscellanea, (i) Some Notes on Interpolation in n-dimension Space. (With 
Eight Diagrams in the text.) By W, Palin Elderton 94 
(ii) Note on the Relative Variability of the Sexes in Carabus 
auratus, L. By H, G. Kribs , . . . . 103 
(iii) Variation in Flower-heads of Gaillardia aristata. (With 
Two Diagrams in the text.) By W. W. RoBBiNS . 106 
(iv) The Effect of Errors of Observation upon the Correlation 
Coefficient. By J. A, Cobb . . . , .109 
(v) On Heredity in Sex. Remarks on Mr Cobb's Note. By 
Karl Pearson, F.R.S. , . , . . .109 
(vi) On the Influence of Double Selection on the Variation and 
Correlation of two Characters. ByKAiiL Pearson, F,R.S. Ill 
(vii) On certain points concerning the Probable Error of the 
Standard Deviation, By Raymond Pearl . . ,112 
(viii) Addendum to Memoir : " Split-Hand and Split-Foot De- 
formities," By Thomas Lewis 117 
(ix) On a Formula for Determining r (« -I- 1). Editorial . 118 
(x) On the Inheritance of the Sex-Ratio in .the Thoroughbred 
Racehorse. By David Heron ... . .120 
Notices and Bibliography , , . , , 123 
Bioinetrika appears about four times a year,. A volume containing about 
500 pages^ with plates and tables, is issued annually. 
Papers for publication should be sent to Professor Karl Pearson, Uni- 
versity College, London. It is very desirable that a copy of all measurements 
made, not necessarily for publication, should accompany each paper. In all cases 
the papers themselves should contain not only the calculated constants, but the 
distributions from which they have been deduced. Diagrams and drawings should 
be sent in a state suitable for direct photographic reproduction, and if on decimal 
paper it should be blue ruled, and the lettering only pencilled. 
Books and offprints, for review or notice in the bibliography should .be sent to 
Prof, Pearson, and, when a second copy is available, to Dr Raymond Pearl, 
Maine Agricultural Experiment Station, Orono^ Maine, U.S.A. 
Papers will be accepted in German, French or Italian. In the first 
case the manuscript should be in Roman not German characters. 
Contributors receive 25 copies of their papers free. Twenty-five or fifty 
additional copies may be had on payment of 3/6 or 6/- respectively per sheet of 
eight pages: these should be ordered when the final proof is returned. 
All communications, other than those relating to contributions or publications 
for review, should be addressed to the University Press, Cambridge. 
The subscription price, payable in advance, is 30s. net per volume (post free); 
single numbers 10s, net. Volumes I, II, III, IV and V (1902 — 7) complete, 30s. net 
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