AUTHOR 8 ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, DECEMBER 29 



THE PARATHYROID GLANDS OF THYROIDLESS 

 BUFO LARVAEi 



BENNET M. ALLEN 

 Department of Zoology, University of Kansas 



It has been long known that there is a close interrelation be- 

 tween certain of the glands of internal secretion. Most of the 

 earlier experiments upon the relationship between the thyroid 

 and parathyroid glands have been carried out upon mammals, 

 and for this purpose carnivores have been selected. In the 

 removal of the thyroid gland the internal parathyroids have 

 been likewise extirpated. The resulting enlargement of the lat- 

 eral parathyroids in such cases might be attributed to the ab- 

 sence of the internal parathyroids, in part at least. The present 

 work is free from this objection, because the operation of remov- 

 ing the^ thyroid gland from anuran larvae in no wise affects the 

 parathyroids. 



A brief discussion of the literature upon the relationship be- 

 tween these glands will be in order. Gley ('92, '95) discovered 

 that the removal of the thjrroid and inner parathyroid glands 

 brought about hypertrophy of the lateral parathyroids. He also 

 claimed that in these cases the parathyroids took on the structure 

 of the thyroid glands and showed deposition of colloid material. 

 In a later paper he retracted these statements regarding the as- 

 sumption of the structural characteristics of the thyroid gland. 

 Vincent and Jolly, also Vincent, Halpenny, and Thompson 

 ('09) have reported on the development of thyroid characteris- 

 tics in the lateral parathyi-oid glands of dogs after the removal 

 of the thyroid and internal parathyroid glands. Biedl found 

 that in the case of young dogs, removal of the thyroid glands 



1 A preliminary account of this work was presented at the 1918 meeting of the 

 American Society of Zoologists and published in the Anatomical Record, January 

 20, 1919. Press of work has prevented earlier publication. 



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