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MASS. EXPERIMENT STATION BULLETIN 417 



Effect of Sulfanilamide Injection on the Calcification of tlie Eggshell. 



(The eggs are shown from their blunt end.) 



Unnumbered— Smooth egg before injection. 

 1— soft-shelled egg 1 day after injection. 

 2— rough-shelled egg 2 days after injection. 

 3— smooth-shelled egg 5 days after injection. 



