II] 



XXIX 



I' a hypergcomotrical, including a binomial, series, and approximately also the 

 tail of any frequency curve by Camp's process*. This is discussed under the 

 section of this Introduction devoted to Table III. 



One remaining point may be ivf'rnvd to. On account of the cost the table is 

 published without differences. The reader i- ivrorimididc-d to use the central 

 difference formula 



u l+6 = < 



+ (2 



where <f> = I 0, and 



It will generally be unnecessary to use 8 4 . 

 The following general statements may be made. 



* Biometrikti, Vol. xvi. pp. 163171; Vol. xvn. pp. 6167. 



f It may be better to find first, and then its reciprocal in this case. 



