IV CONTENTS 



W. W. Swingle. The acceleration of metamorphosis in frog larvae by 

 thyroid feeding, and the effects upon the alimentary tract and sex glands. 

 Fourteen figures 521 



W. W. Swingle. The effect of inanition upon the development of the germ 



glands and germ cells of frog larvae. Fourteen figures 545 



George S. Terry. Effects of the extirpation of the thyroid gland upon 



ossification in Rana pipiens. Two text figures and two plates 567 



James B. Rogers. The effect of the extirpation of the thyroid upon the 

 thymus and the pituitary glands of Rana pipiens. One plate and two 

 charts 589 



