MODIFICATION OF THE GERM-CELLS IN MAMMALS 



205 



13. THE RECORDS OF NORMAL MALES AND FEMALES PAIRED SUC- 

 CESSIVELY WITH NORMAL AND ALCOHOLIC MATES: THE 

 CRUCIAL DEMONSTRATION OF THE EFFECTS OF 

 ALCOHOLISM ON THE OFFSPRING 



When the records of any group of experimental animals are 

 compared with the records of a normal group, the possibility 

 presents itself that some selection either conscious or uncon- 

 scious may have played a part in forming the groups. Such a 

 source of error is no doubt practically eliminated by many well- 

 known methods of choosing control and experimental animals 

 from a given population. We believe such a defect is entirely 

 insignificant in the foregoing records which have involved many 

 animals through several generations from the same stocks in the 

 case of both the experimented and the control. It is, never- 

 theless, satisfactory to consider the records of the same nor- 

 mal animals paired successively with control animals and with 

 animals of the alcoholic lines. Table 9 presents all of the mating 

 records of fourteen normal males and fifteen normal females 

 that have been paired in this way. This table gives a most 

 perfect control and shows most clearly the alcohol effects. 



XABLE, IX 



WITH ^OKMAL Ar^n y^LCOHOLlC y^^ATES 



