EFFECT OF THYROID FEEDING. 



285 



FIG. 3. Three wing feather from young Brown Leghorns showing continuity 

 of feathers in succeeding generations as a result of thyroid feeding. Only a portion 

 of each second generation feather is shown (below). 



effects of nutritive deficiency. Such effects vary in intensity 

 with the dose of thyroid administered. The "quilling" in the 



