DR. MANUEL GAMIO 

 Mexico City, Mexico. (Fig. 12. 



DR. JON ALFRED MJOEN 



W'inderen Lal)oratorium, Kristiania, 

 Norway. (Fig. 13) 



DR. N. WILLE 



Chairman, Norwegian Consultative 



Committee for Kace Hygiene, 



Kristiania, Norway. (Fig. 14) 



PROF. VICTOR DELFINO 



Hiienos .Aires, South .America. (Fig. 15) 



