92 WILLETS. 



Since parasites apparently contributed to the death rate at Bilibid 

 Prison, it is permissible to believe that they are to be reckoned with in 

 considering the morbidity; that is, the problem of intestinal parasitism 

 is not only of medical but, also, of economic importance. 



Confronted with the results obtained at Bilibid Prison and with those 

 of the statistical studies of over 19,000 people in the Islands, approxi- 

 mately 86 per cent of whom, as the result of a meager examination were 

 found to harbor one or more parasites, the problem of the proper disposal 

 of human excreta is brought vividly to our attention. The fact that 

 cholera, the various dysenteries, and other diseases would markedly be 

 influenced by a proper disposal of the excreta does not subtract from the 

 importance of the problem. 



ACKNOVS^LEDGMENTS. 



I was in the Cagayan Valley at a time when the people were very 

 busy with their crops. The two haciendas are broken up into small 

 cabecerias, and the tenants are provided with" medical advice and treat- 

 ment free of charge ; thus my endeavors to make this study must have 

 failed but for the cooperation of Senoi-es Orros and Mesa, administradores 

 of San Antonio and Maluno, respectively. I wish to acknowledge my 

 indebtedness to them and their assistants for many courtesies. 



Mr. Manuel Eamirez and Mr. Rafael Santos, fourth-year students in 

 the College of Medicine and Surgery, University of the Philippines, 

 rendered me valuable assistance in the examinations, and I wish to express 

 my thanks to them also for their thorough, painstaking work. 



