424 Scientific Proceedings (124). 



by the animal and the time in seconds were recorded for each trial- 

 The results were as follows: 



Relearning the Simple Labyrinth. 





Total No. of Trials. Total No. of Errors. 



Total Time. 



Normal Lamb 



4 





4 



472 sec. 



Cretin Lamb 



3 





0 



173 sec. 



Learning the Labyrinth with 



the Position 



OF THE CUL 



de Sac Reversed. 





Total No. 



Total No. 



Total No. 



Total 





of Trials. 



of Errors. 



of Steps. 



Time. 



Normal Lamb 



6 



27 



3176 



1226 sec. 



Cretin Lamb 



5 



34 



6016 



4821 sec. 



One hundred forty-seven days following extirpation of the 

 thyroids another cretin, markedly lethargic, was tested. She was 

 given three trials but was unable to escape from the labyrinth 

 which she had learned before being thyroidectomized. The re- 

 sults of these tests were: 



Relearning the Simple Labyrinth. 







No. of Errors. 



No. of Steps. 



Time. 



Cretin Lamb . . . 



1st trial 

 2d " 

 3d " 



46 

 16 

 10 



3548 

 1570 

 1 193 



Removed in 2 hrs. 

 " " ft " 







Total No. 

 of Trials. 



Total 

 Errors. 



Total 

 Steps. 



Total 

 Time. 



Normal Lamb . . 



6 



8 



3116 



963 sec. 



The other two cretins did not become noticeably lethargic, 

 although they were dwarfed in stature as compared with their 

 twins. Tests were begun on one of these lambs and her normal 

 twin two hundred six days following thyroidectomy. The results 

 were : 



Relearning the Simple Labyrinth. 





Total No. 



Total No. 



Total No. 



Total 





of Trials. 



of Errors. 



of Steps. 



Time. 



Normal Lamb 



4 



4 



2452 



552 sec. 



Cretin Lamb 



4 



3 



3548 



557 sec. 



