Karl Pearson and David Heron 
231 
From Table XIII. 
Gaussian Surface for '3. 
1-4 
5—8 
Totals 
1—4 
634-97 
121-03 
756 
5—8 
167-03 
76-97 
244 
Totals 
802 
198 
1000 
Actual Correlation -300. 
Yulean <^> ... -167. 
In other words for any surface approaching the Gaussian the Yulean </> for a 
fourfold table with such frequencies in the total columns must be raised by "20 in 
the scale of correlation. Let us consider the same sort of tables in non-Gaussian 
materia], material of Mr Yule's own choosing ; we have the following fourfold 
tables : 
From Table XIX. 
Age of Wife. 
O ti 
cS 
CD -Q 
bo ES 
a 
b-f 
Totals 
a 
1,135,815 
110,553 
612,932 
3,458,220 
1,748,747 
3,568,773 
Totals 
1,246,368 
4,071,152 
5,317,520 
Actual Correlation -925. 
Yulean 0 ... -686. 
From Table XVI. Heredity of Mendelian Couplets. 
Father. Father. 
so 
a 
'G 
-CO 
o 
0 
1-4 
Totals 
Tspring. 
0—1 
2-4 
Totals 
0 
1-4 
625 
671 
671 
2129 
1296 
2800 
0—1 
2-4 
2425 
599 
599 
473 
3024 
1072 
Totals 
1296 
2800 
4096 
O 
Totals 
3024 
1072 
4096 
Actual Correlation -333. 
Yulean </> ... -243. 
From Table XVIII. 
Southampton. 
Actual Correlation -333. 
Yulean ij> ... -243. 
Barometer Heights. 
Southampton. 
cS 
h-3 
1-4 
5 — 8 
Totals 
audale 
1—2 
3 — 8 
Totals 
1—4 
5—8 
2053-25 
244-25 
222-75 
401-75 
2276 
646 
1 -2 
3—8 
659 
233 
321-5 
1708-5 
980-5 
19415 
Totals 
2297-5 
624-5 
2922 
M 
Totals 
892 
2030 
2922 
Actual Correlation -780. 
Yulean <fr ... -531. 
Actual Correlation -780. 
Yulean <fr ... -566. 
