213 



§5.311 BALANCE OF MONOVALENT ELECTROLYTES 



The suggestion that the hypophysis acts by secretion of TSIi 

 arises from the fact that the thyroid, which it would stimulate, is 

 active during the upstream (anadromous) migration of salmon and 



Fig. 5-14. Loss of sodium by excretion (ordinates) in hours 

 (abscissae) from nine adrenalectomized frogs, Rana, (above) and 

 from nine controls (below). After 24 hr in distilled water, (at 

 hour 0) 5 mg Na (as frog Ringer solution) was injected into the 

 dorsal lymph-sac of each, and excretion was recorded for the first 

 4 hr and at the end of 24 hr (points shown with standard 

 deviation). Note the much greater excretion of sodium from the 

 adrenalectomized frogs (from Fowler in Chester Jones, 1957). 



eels from the sea. Since these fish show a concurrent phase of 

 growth and maturation, it seems more probable that the thyroid 



