AUTHORS ABSTRACT OF THIS PAPEK ISSUE O 

 BY THE BIBLIOGRAPHIC SERVICE, JUNE 2 



ON THE PHYSIOLOGICAL PROPERTIES OF THE 



GONADS AS CONTROLLERS OF SOMATIC AND 



PSYCHICAL CHARACTERISTICS 



II. GROWTH OF GONADECTOMIZED MALE AND FEMALE RATS 



CARL R. MOORE 

 Hull Zoological Laboratories, The University of Chicago 



ONE FIGURE 



During a study of the effects of transplanted gonads in modi- 

 fying somatic and psychical characteristics in mammals/ it 

 was highly desirable to know the relations of the growth curve 

 of gonadectomized male and female rats before the effects of 

 homoplastic transplantation of gonads could be correctly 

 interpreted. 



Many investigators have shown that the growth curve of 

 normal male rats is consistently and considerably above that of 

 normal female rats.^ Steinach,^ after gonadectomy of young 

 male and female rats and subsequent transplantation to each of 

 the gonad of the opposite sex, noticed that the growth (weight) 

 of the females had a tendency to be above the normal for females 

 and that of the males to be lowered from the normal for un- 

 operated males, provided the transplantations were successful; 

 and he has not only associated these changes with a supposed 

 modification of sex, but has used the changes as a criterion of 

 sexual changes. 



Stotsenburg, however, in a careful series of experiments, has 

 shown that the elimination of the ovaries of young female rats, 

 without the subsequent transplantation of testis, causes the 

 growth curve of the spayed females to be increased 17 per cent 



1 Moore ('19). 



- See Donaldson ('15). 



2 See Steinach ('10, "11, '12, '13). 



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