114 



C. M. JACKSON 



Controls at 3 weeks 



Coii.stant 3 to 10 \vt 



Controls at 10 weeks 



Fig. 3 Diagram representing the average relative (percentage) weights of 

 parts of the body (head, extremities and trunk) in albino rats held at constant 

 body-weight from the age of three to ten weeks, and in controls at three and at 

 ten weeks of age. 



