REJUVENATING A RAT. 



A rat, showing the symptoms of old age. By means of operations which stimulated the interstitial gland, or by 

 grafting into rats reproductive organs from young animals, they became rejuvenated. (See illustration below.) 



Reproduced from SteintMh's " Verjun^ung." 



The same rat, rejuvenated by Steinach's operation. 



