72 STATISTICAL METHODS. 



Fertility (percentage of births with one year of marriage) 

 of wives at different ages, Powys, '01. 



Rays in dorsal fin of Pleuronectes s , Duncker, '00. 

 " "anal " " " ?, 



Type IV. 



Stature of St. Louis schoolgirls, Pearson, '95, p. 386. 

 a=- 0.489. 



Number of teeth, Palsemonetes varians Plymouth, Pear- 

 son, '95, p. 404. a =0.134. 



Stature of Australian whites, Powys, '01. 

 Rays in dorsal fin of Pleuronectes, ? , Duncker, '00. 

 " tl anal " " " s " " 



il " pectoral " " " S " " 



Type V. 



Number of lips of medusa, P. pentata, Mayer, '01, Pearson, 

 'Ol d . a=.549. 



Norigal. 



Stature, U. S. recruits, Baxter, 75, Pearson, 95, p. 385. 

 Ray frequency, Pectens, Davenport, '00, '03 b . 



Skewness. 



GENERAL. Mathematical Analysis. Pearson, '95, 'Ol d , '02 f , 

 '02&, '02 m . Biological Interpretation. Davenport, 'Ol b , 'Ol c . 



Quantitative Results. 



Numerous cranial characters, Naquada race, Fawcett, '02. 



Nearly always +. 



Num. lips of medusa, P. pentata (Mayer, '01 ; Pearson, 'Ol d ) + .549 



Num. Miillerian glands, legs of swine (Pearson and Filon, '98). . . + .311 



Num. dorsal teeth, Palsemonetes varians (Pearson, '95) + .130 



Num. rays, Pecten opercularis, Irish Sea (Davenport, '03 1 ') + .087 



Eddystone (Davenport, '03 b ) .... + .080 



" hooks on statoblasts, Pectinatella (Davenport! '00 e ) + .077 



Weldon's crab measurements, "No. 4 " (Pearson, '95) + .077 



Num. rays lower valve, Pecten irradians, L. I (Davenport, '00 C )4- .023 



41 " " " P. opercularis, F. of Forth + .007 



" " upper valve, P. irradians (Davenport, '00 C ) .000 



Height, British criminals (Macdonell, '02) - .023 



Baxter's height of U. S. recruits (Pearson, '95) - .038 



Porter's height of 2192 St. Louis schoolgirls (Pearson, '95) - .049 



Head breadth, British criminals (Macdonell, '02) .051 



