AUTHOR S ABSTRACT OF THIS PAPER ISSUED 

 BY THK BIBLIOGRAPHIC SERVICE, JUNE 2 



GROWTH AND DEVELOPMENT OF AMPHIBIA AS 

 AFFECTED BY THYROIDECTOMY 



E. R. HOSKINS AND M. M. HOSKINS 



Osborn Zoological Laboratory, Yale University, and Department of Anatomy, New 

 York University 



NINE PLATES (oNE HUNDRED AND NINE FIGURES) 



CONTENTS 



Inti'oduction 2 



Technique 3 



Results 4 



Amblystoma punctatum 4 



Growth 4 



Microscopic changes 4- 



Rana sylvatica 5 



Growth of body 6 



Length and volume 13 



Regeneration 15 



Forced metamorphosis 16 



Discussion of growth and metamorphosis 17 



Organs, and method of comparison (discussion follows description of each 



organ) 19 



Brain 21 



Eyeballs 22 



Heart 22 



Liver 22 



Hypophysis 23 



Thymus 29 



Epithelioid (parathyroid) bodies 32 



Thyroid 33 



Spleen 36 



Kidneys 36 



Gills and lungs ; 37 



Intestines 38 



Adrenals 38 



Skin 38 



Ovaries 39 



Testes ; 43 



Summary and conclusions 46 



Literature cited 49 



1 



