Abstract
Administration of KI in the guinea pig, during the process of compensatory hypertrophy of the thyroid and in the normal guinea pig, causes a stimulation of the gland tissue, in which softening and solution and increased growth processes are noticeable. In the normal gland the growth processes initiated by I are prominent, whereas in compensatory hypertrophy, where removal of a great part of the gland tissue as such causes marked stimulation, changes in the colloid are more pronounced. Structural changes thus produced make it possible in many cases to recognize whether I has been administered during the process of compensatory hypertrophy. The various changes induced by the administration are discussed and the possible relationship which these changes have to each other.