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L. V. DOMM AND MARY JUHN. 



the bird at the beginning and end of the experimental period is 

 stated. The weights of the removed, hypertrophied and control 

 glands are expressed in grammes and in per cent, of the body 

 weight of the fowl. 



In the group A (Table I.), where unilateral castrations were 

 performed on baby chicks aged one week, six operated birds and 



TABLE I. 



RESULTS OF UNILATERAL CASTRATION AT ONE WEEK. 



The measurements given for the testes removed at unilateral castration are 

 in mm. All weights are in grammes. Per cent, weight = percentage of weight 

 of testis to total weight of bird. 



1 c = control. 



five controls survived for a period of about thirty-one weeks. 

 Unilateral castrations were performed on thirty-five baby chicks 

 and there were a large number of controls; the mortality was 

 due not so much to operative effects but to the very unfavourable 

 weather conditions. Of the six surviving operated birds, three 

 had a left testis while the other three had a right one. Each 

 surviving left gonad is larger than any of the ten control testes; 

 in two of the three cases each surviving left testis is larger than 



