GOXTENTS OF VOLUME XII. 
Memoir's. 
I. On the Standard Deviations of adjusted and interpolated Values i >t 
an observed Polynomial Function and its Constants and the 
Guidance they give towards a proper Choice of the Distribution 
of Observations. By KiRSTiNE Smith 
II. On the Product-Moments of Various Orders of the Normal Corre- 
lation Surface of two Variates. By Karl Pearson and A. W. 
Young . . . 
III. The Correlation Coefficient of a Polychoric Table. By A. RlTCHlE- 
SCOTT 93 
IV. On a Formula for the Product-Moment Coefficient of any Order of 
a Normal Frequency Distribution in any number of Variables. 
By L. IssERLlH 134 
V. On the Mathematical Expectation of the Moments of Frequency 
Distributions. Part I. By Al. A. Tchouproff . . .140 
VI. On the Mathematical Expectation of the Moments of Frequency 
Distributions. Part II. By Al. A. Tchouproff . . .18.5 
VII. An Explanation of Deviations from Poisson's Law in Practice. By 
Student 211 
VIII. The Criterion of Goodness of Fit of Psychophysical Curves. By 
Godfrey H. Thomson 216 
IX. On Cori'ections for the Moment-Coefficients of Limited Range 
Frequency Distributions when there are finite or infinite 
Ordinates and any Slopes at the Terminals of the Range. By 
Eleanor Paikman and Karl Pearson 231 
X. Peccai'imus ! Editorial ......... 259 
XL Quadrature Coefficients for Sheppard's Formula (c). Calculated 
by P. F. EvERiTT 282 
XII. On generalised Tchebycheff Theorems in the Mathematical Theory 
of Statistics. By Karl Pearson 284 
XIII. Charles B. Goring, 1870—1919. Obituary Notice and Appre- 
ciations ........... 297 
86 
