Effect of Thyroidectomy. 



423 



TABLE III. 



Differential Count of the Cells in Pars Anterior of Hypophysis from 

 a 63-YR.-OLD Woman" (Autopsy Number 21-190 — 3 hr. Post Mortem). 



Total fields from three different levels 150. Sections 5M thick. Formalin 

 fixation. Mallory's C.T. Stain. 





All Types 



Chromo- 







Cell Types. 



Together. 



phobes. 



Acidophiles. 



Basophiles. 



Number of cells counted . . 



25,658 



14.776 



8,510 



2,372 



Percentage 



100 



57-6 



33-2 



9.2 



Abstracts of the Communications. 

 Western New York Branch. 

 Ithaca, New York, May 20, IQ22. 

 207 (1954) 



The effect of thyroidectomy on the intelligence of sheep. 



By H. S. LID DELL (by invitation). 



[From the Department of Physiology and Biochemistry, Cornell Uni- 

 versity Medical College, Ithaca, N. Y.] 



The procedure followed in attempting to determine the effect 

 of thyroidectomy on the intelligence of sheep has already been 

 described. 1 Four pairs of twin female lambs from three to four 

 weeks old were caused to learn a labyrinth with a single cul de 

 sac and the twin of each pair making the better record was thy- 

 roidectomized by Dr. Simpson. Two months later the operated 

 lambs had become typical cretins. 



One hundred two days following thyroidectomy one of the 

 cretins, already definitely lethargic, and her normal twin began 

 relearning the labyrinth. The position of the cul de sac was then 

 reversed and the labyrinth was again learned. Learning was 

 taken to be complete at the end of three trials without error; an 

 error being counted whenever the animal entered the cul de sac 

 or turned back along the true path. The number of steps taken 



1 Liddell H. S., Proc. Soc. Exper. Biol, and Med., 1922, xix, 343. 



