524 SUTHEKLAJSTD SIMPSON 



May 24, and a tracing was obtained from it on May 25 six months after 

 the complete operation showing both the muscular tremors and larger 

 clonic contra'ctions characteristic of postoperative tetany (see Fig. 2).* 

 The fourth died on March 4 one hundred and five days after the 

 operation greatly emaciated, but without ever having shown any signs of 

 tetany. At the postmortem examination two dead fetuses were found in 

 utero. A careful search revealed no trace of either thyroid or parathyroid 

 tissue. The fifth, with two external parathyroids left intact but both 

 lobes of thyroid removed, died on April 4 one hundred and thirty-six 



Fig. 2. Tracing from temporal muscles of sheep in tetany 187 days after both 

 lobes of thyroid, including internal parathyroids, and two external parathyroids had 

 been removed. 



days after the operation of what the veterinary pathologist who conducted 

 the autopsy described as "acute exudative rhinitis and pneumonia." A 

 dead fetus at 'about full term was found in the uterus and there was also 

 some hemorrhage and necrosis in the cotyledons of the placenta. 



This ewe had not lost flesh. The control, which gave birth to a 

 healthy male lamb on April 6, is alive and in good condition. The details 

 of this experiment will be published later. 



It is not improbable that certain conditions in body metabolism, not 

 yet understood, have a determining influence on the results which follow 



* Subsequent to the writing of this article, the ewe shown, in the photograph was 

 killed (Dec. llth, 1!)20) and a careful search made for accessory thyroid and para- 

 thyroid tissue. Five suspicious pieces were removed from the neck and on microscopic 

 examination three of these proved to be hemolymph nodes, and two, measuring 5x3x2 

 mm. and 7x5x4 mm., respectively, consisted of thyroid tissue. No accessory parathy- 

 roids were found. 



