Transplantation of Parathyroid Glands. 77 



tetany developed within twenty-four hours and death occurred 

 within forty-eight. Isotransplantation or isografting (two grafts) 

 was unsuccessfully resorted to 24 hours after the supervention of 

 tetany. 



Summary. — Our experiments have proved that in dogs 



1. Parathyroid glands are essential to the life of the animals, 

 and that tetany follows their removal. 



2. Transplanted parathyroids (autografts) may for an undeter- 

 mined time perform at least the most evident function of these 

 bodies. 



3. One successfully transplanted parathyroid may suffice to 

 maintain a fair degree of health ; traces of hypoparathyroidism 

 may persist. 



4. In autotransplantation success is more common than failure. 



5. Heterotransplantation rarely succeeds. 



6. For the successful transplantation of these organs a 

 deficiency of parathyroid tissue should be created. 



7. Transplanted in excess of what is required by the organism 

 parathyroid glands do not survive. 



8. Excised or deprived of their blood supply in the course of 

 an operation parathyroids should probably be reimplanted, pref- 

 erably into the thyroid gland. 



9. Complete excision of the thyroid lobes is well borne, for 

 months at least, by these animals. Myxedema begins to manifest 

 itself in a few weeks. 



42 (298) 



The nervous coordination of the auricles and ventricle of the 

 heart of the lizard. 



By MARIE IMCHANITZKY. 



[Front the Halle rianum, Bern, Switzerland.] 



Communicated by S. J. Meltzer. 



The following investigation was carried out on the hearts of 

 lizards {Ocellata lacerta) for the purpose of studying the nature of 

 conduction between the auricles and ventricles in these animals. 

 The experimental part was done at the Zoological Station of 



