GROWTH AFFECTED BY FEEDING DUCTLESS GLANDS 311 



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Chart 3 Graphic representation of the growth of the 'younger' or 'high 

 dosage' female albino rats to which ductless glands were fed. The weight in 

 grams is plotted against the age in days. 1, Thyroid-fed; 2, Thymus-fed; 3, 

 Muscle-fed (controls; see also chart 1); 4- Hj^pophysis-fed; 5, Pineal-fed. Note 

 how closely the various groups agree in weight. At 70 days, autopsy of the larg- 

 est rats was begun, hence the greater variation after this^point. 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 21, NO. 3 



