The Determination of Sex 



367 



localities from which he obtained the eggs, with the following 

 results : 



The meaning of the enormous difference is by no means clear. 

 Lenhossek has suggested that if the Utrecht egg were to be fer- 

 tilized with sperm from the Konigsberg race, and vice versa, 

 interesting results in regard to whether the egg or the spermato- 

 zoon determines the sex might be obtained. 



Geddes and Thomson state that in fishes the females are usu- 

 ally more numerous than the males, never less so, except in 

 anglers and catfish. They give the following data : 



Flounder 

 Roughead 

 Cod 

 Gurnard 



FEMALE 



I tO 



12 tO 



3 to 

 9 



MALE 

 I 

 I 

 2 

 tO 2 



There is a further point of some importance in regard to man, 

 namely, the proportion of males and females that occur in abor- 

 tive births and of still-born infants. The statistics show that a 

 much larger number of these are males. Thus Rauber found 

 the proportion for 57 embryos was 159 males to 100 females. 

 Lenhossek examined 156 embryos (between the third and sixth 

 month), and found the proportion to be 160 males and 100 

 females. 



For still-born infants, fully formed, but not alive, the follow- 

 ing figures have been given : 



