EFFECT OF EXTIRPATION OF THYROID 603 



PLATE 1 



Magnification 12 

 Pituitary glands of thyroidless tadpoles 



1 Pituitary gland of thyroidless tadpole 5 



2 Pituitary gland of thyroidless tadpole 6 



3 Pituitary gland of thyroidless tadpole 7 



4 Pituitary gland of thyroidless tadpole 8 



5 Pituitary gland of thyroidless tadpole 9 



6 Pituitary gland of thyroidless tadpole 10 



Pituitary glands of normal tadpoles 



7 Pituitary gland of tadpole control 5 



8 Pituitary gland of tadpole control 6 



9 Pituitary gland of tadpole control 7 



10 Pituitary gland of tadpole control 8 



11 Pituitary gland of tadpole control 9 



12 Pituitary gland of tadpole control 10 



Pituitary glands of recently metamorphosed frogs 



13 Pituitary of control frog 13 



14 Pituitary of control frog 14 , 



15 Pituitary of control frog 16 



Pituitary glands of sexually mature young frogs 



16 Pituitary gland of control frog 17 



17 Pituitary gland of control frog 20 



18 Pituitary gland of control frog 21 



19 Pituitary gland of control frog 22 



20 Pituitary gland of control frog 23 



21 Pituitary gland of control frog 24 



Thymus glands of thyroidless tadpoles 



22 Left thymus gland, thyroidless 6 



23 Left thymus gland. 24 Right thymus gland, thyroidless 7 



25 Right thymus gland, thyroidless 8 



26 Left thymus gland. 27 Right thymus gland, thyroidless 9 

 28 Left thymus gland. 29 Right thymus gland, thyroidless 10 



Thymus glands of normal tadpoles 



30 Left thymus gland. 31 Right thymus gland, control 5 



32 Left thymus gland. 33 Right thymus gland, control 6 



34 Left thymus gland. 35 Right thymus gland, control 7 



36 Left thymus gland. 37 Right thymus gland, control 8 



38 Left thymus gland. 39 Right thymus gland, control 9 



40 Left thymus gland. 41 Right thymus gland, control 10 



