CONTENTS 
{All Eights reserved) Z*' 
PA<JB 
I. Data for the Problem of Evolution iii Man. On Fertility, Duration 
of Life and Reproductive Selection. By A. 0. PowYS. (With 
nineteen Diagrams in the text.) . . . . . . . 233 
II. Contributions to the Study of Interracial Correlation. By E. Tsche- 
POURKOWSKY . . . . . 286 
III. Statistical Studies in Immunity. Smallpox and Vaccination. By 
John Brownlee, M.A., M.D. . . .... .313 
IV. On Tests for Linearity of Regression in Frequency Distributions. 
By John Blakeman, M.Sc, B.A 332 
V. The Long Barrow and Round Barrow Skulls in the Collection of the 
Department of Comparative Anatomy, The Museum, Oxford. By 
E. H. J. Schuster, M.A. (With one Figure in the text, six Plates 
and three folding Tables.) . . 351 
VI. The Egg of Cuculus Canorus. An Attempt to Ascertain from the 
Dimensions of the Cuckoo's Egg if the Species is Tending to 
Break up into Sub-species, each Exhibiting a Preference for some 
one Foster-parent. Second Memoir. By Oswald H. Latter. . 363 
Miscellanea. Notes on Statistical Processes. By W. Palin Elderton. . ^74! 
Biometrika will appear about four times a year. A volume containing 
about 400 pages, with plates and tables, will be issued annually. 
Papers for publication should be sent to Professor W. F. R. Weldon, 
Merton Lea, Oxford, to Professor Karl Pearson, 7, Well Ro^d, Hampstead, 
London, or to Professor C. B. Davenport, University of Chicago, Illinois, U.S. 
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 6Ztte ruled. 
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, should 
be addressed to the University Press, Cambridge. 
The subscription price, payable in advance, is 305. net per volume (post free) ; 
single numbers lOs. net. Volumes I, II and III (1902 — 4) complete, 30s. net 
per volume. Bound in Buckram 34/6 net per volume. Subscriptions may be 
sent to C. F. Clay, Manager, Cambridge University Press Warehouse, Fetter 
Lane, London, E.G., either direct or through any bookseller. 
