210 STKONG. 



iiinoiig the ineiubers of the expedition, each giving his special attention 

 to the M-ork to which he was assigned, nevertheless consideraljle of the 

 work was cai-ried on by all the members of the expedition together; as, 

 for example, the mapping of the town and the preparation of the census. 

 Plence, while the individual reports have been written by those members 

 of the expedition M'ho performed the greatest relative amount of work 

 upon the subject, nevertheless it should be understood that much of the 

 work of the expedition was carried out by all of its resident members 

 working together. 



Special bacteriological examinations, such as of the waters of the town 

 and of fasces for cholera vibrios, were performed at the Biological Lalwra- 

 tory in Manila where these specimens were sent daily by messenger. 



In perusing the individual reports, it must be considered that in de- 

 termining the incidence of certain diseases the members of the expedition 

 relied solely upon the attendance of the individuals at the clinic; while 

 in determining the incidence of the others, practically the entire popula- 

 tion of the town was canvassed carefully. Therefore, the results obtained 

 in relation to each disease must be carefully interpreted if they are to be 

 used as an expression of the prevalence o! such disease in the general 

 population; obviously the same basis can not be used in computing the 

 percentages for all diseases among the Filipino population throughout the 

 Island of Luzon. 



In the preparation of the reports upon the laboratory work performed 

 at Taytay and the study of disease there, the subjects were considered and 

 discussed jointly by Doctors Garrison, Nichols and Clements, and have 

 been prepared for publication by these gentlemen, Doctor Teague and tlie 

 writer. 



This expedition is probably one of the most extensive of its kind that 

 has ever been carried out and is certainly the most extensive medical 

 survey that has ever been undertaken in the Philippine Islands. Its ac- 

 complishment was largely made possible through the efforts of Doctor 

 Freer, Director of the Bureau, wdio, before his departure on his vacation 

 early in April, did much to organize, arouse interest in and to stimulate 

 the work of the expedition. The special reports of the members of the 

 survev follow. 



