CONTENTS 
{All Rights reserved) 
FAai 
I. Mosquitoes and Malaria. A Study of the Relation between the 
Number of Mosquitoes in a Locality and the Malaria Rate. By 
H. Waits, M.A., B.Sc. (With Five Diagrams in the text) . 421 
II. Tables of the Tetrachoric Functions for Fourfold Correlation Tables. 
By P. F. EvERiTT, B.Sc. . . . . . . . . 437 
III. On the Selective Elimination occurring during the development of 
the Fruits of Staphylea. ' By J. Arthur Harris, Ph.D. (With Nine 
Diagrams in the text) . . .452 
IV. A Biometric Study of Phagocytosis with Special Reference to the 
Opsonic Index. Second Memoir: On the Distribution of the 
Means of Samples. By M. Gre&nwood, Junr. and J, D. C. 
White. (With Eight Diagrams in the text) . . . .505 
V. On the Constants of Index-Distributions as deduced from the like 
Constants for the Components of the Ratio, with Special Reference 
to the Opsonic Index. By Karl Pearson. (With Three 
Diagrams in the text) '. _ . 531 
Miscellanea, (i) On the value of the Teachers' Opinion of the General 
Intelligence of School Children. Compiled from the 
Tables and Reductions of H. Gertrude Jones. By 
Karl Pearson 542 
(ii) Note on the Separate Inheritance of Quantity and 
Quality in Cows' Milk. By Karl Pearson . . 548 
The publication of a paper in Biometrika marks that in the Editor's opinion 
it contains either in method or material something of interest to biometricians. 
But the Editor desires it to be distinctly understood that such publication does not 
mark assent to the arguments used or to the conclusions drawn in the paper. 
Biometrika appears about four times a year. A «.olume containing about 
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Papers for publication and books and offprints for notice should be sent 
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