xIv,5 Padua: Cystolithiasis with Dietetic Deficiency 497 
among Filipinos and concomitant nutritional disorders such as 
beriberi favor the formation of phosphatic stones, owing to the 
low daily protein intake and the lessened acidity of the urine 
resulting therefrom. 
I wish to extend my profound gratitude to Dr. Potenciano 
Guazon, chief of the department of surgery, College of Medicine 
and Surgery, University of the Philippines, for the exceptional 
opportunities he has given me to utilize the stones in the museum 
of the operating room of the Philippine General Hospital for 
chemical analysis. To Prof. Bowman Corning Crowell, chief of 
the department of pathology and bacteriology, University of the 
Philippines, I express my sincere appreciation for his strong 
encouragement in the present study. I acknowledge the valuable 
codperation of my colleague, Doctor Aguilar, who has many times 
taken my place when on duty in the hospital. But above all, 
I wish to express my due acknowledgment and most hearty ap- 
preciation to Prof. Robert Banks Gibson, chief of the department 
of physiology, University of the Philippines, for his suggestions 
and priceless help in the preparation of this paper. 
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