130 PHALEN AND NICHOLS. 



Table 1. — Distribution of Filaria nocturna in the PhiUppine Islands. 



Source. 



Ilocanos (Ilocos Norte, Ilocos Sur, and Union) ... 



Cagayanes (Cagayan, Isabela, Infanta, and 

 Nueva Vizcaya) 



Pangasinans (Pangasinan, Tarlae, Nueva Ecija, 

 and Zambales) 



Pampangans (including Macabebes) 



Tagalogs (Bulacan, Rizal, Cavite, Laguna, 

 Batangas, Tayabas, and Mindoro) 



Tagalogs in Manila 



Bicols (Ambos Camaiines, Albay, and Sorsogon). 



Inhabitants of — 



Bohol 



Cebu 



Leyte 



Negros 



Panay 



Samar 



Cotabato 



Lanao and Misamis 



Zamboanga 



Davao 



Miscellaneous 



Total . 



Number 



ex- 

 amined. 



1,019 



394 



374 

 1,140 



399 

 292 

 365 



27 

 519 

 253 

 131 

 536 

 141 

 390 

 191 

 172 



6,384 



Infected. 



Number. Percent, 



125 



0.58 



0.26 



0.0 

 0.088 



0.53 

 4.4 

 10. 1 



7.4 



0.57 



7.8 



1.5 



0.74 



2.8 



1.3 



4.7 



1.25 



0.0 



The 2)ercentage for the various localities can be seen more readily by 

 reference to the accompanying map. The examinations classitiecl as 

 "miscellaneous" were mainly from the Province of Bataan and from the 

 smaller islands, from which localities there were not enough examinations 

 to Avarrant making an estimate of the percentage of infection. The 

 district of Davao has been given tentatively a percentage of between .2 

 and 5. Three infections have been found among a small number of 

 examinations and Captain Ames of the Constabulary service reported 

 that he had found 12 cases in the course of his ordinary medical 

 practice in three years. 



As will be seen from the map, the greater part of Luzon and the 

 populous Islands of Panay, Negros, and Cebu show an infection of less 

 than 1 per cent; in most instances it is much less than this. Among 

 over 50 cases of elephantoid disease of which we have definite records, 

 cmly three lived within these regions. Filarial disease, therefore, is 

 not an important one in this large area. 



However, in southeastern Luzon, and the Islands of Samar, Leyte. 

 and Bohol over 5 per cent of the population is infected, and in some 

 localities fully 10 per cent. Forty of the cases of elephantiasis en- 



