CONTENTS 
{All Rights reserved) 
PAGB 
I. Pigmentation Survey of School Children in Scotland. 
Committee and Grants ......... 129 
Report. By J. F. Tocher, (With Plates I— XXVI, Table II, and 
One Diagram in text) . . . . . . . . . 130 
II. Variation, Development and Growth in Holothuria Floridana, PourtaMs, 
and in HolothurHa atra, Jager. By Charles Lincoln Edwards. 
(With Plates I— V, One Folding Table and Six Diagrams in text) 236 
III. Probable Error of a Correlation Coefficient. By STUDENT . . 302 
IV. Zur Frage vom viergliederigen Tarsus der Blattidae und der Regenera- 
tion der Fiisse derselben. Von Th. S. Schtscherbakow . ,311 
Miscellanea, (i) Note on Inheritance of Brachydactyly. By Thomas 
Lewis 327 
(ii) Note on Inheritance in Man. By K. Pearson . . 327 
Special Supplement to Vol. VI. 
Pigmentation Survey of School Children in Scotland. Appendix to the 
Report. By J. F. Tocher. (This Appendix gives the classified Returns 
for all Divisions, Counties and Districts of Scotland, and a complete List 
of the contributing Teachers) .pp. 1 — 67 
Biometrika 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 measarements 
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