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 5 , 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. 

 " " anal " " i( & " ll 



" " pectoral " " " $ " " 



Type V. 



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

 'Ol d . a=.549. 



Normal. 



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

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



Skewiiess. 



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

 '02^, '02 ra . Biological Interpretation. Davenport, ; 01 b , 'Ol c . 



Quantitative Results. 



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



Nearly always -K 



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



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



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



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

 Eddystone (Davenport, '03 h ) . . . . + .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 )+ .023 



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



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



