— 33 9 
Percentage of single infections, 51,9 %. 
Percentage of double infections, 32,8 %. 
Percentage of triple infections, 14,7 %. 
Percentage of quadruple infections, 0,4 %. 
(The instance of the quadruple infection was in a female im¬ 
bécile. In addition to the nematodes, amoebae and flagellâtes 
were also présent.) 
In fourteen of the very filthy patients, there was a slightly in- 
creased number of parasites of each kind noted. 
Percentage infected . 71,4 °/ Q 
Hookworm infections . 64,2 0 / o 
Whipworm infections . 42,8 °/ Q 
Roundworm infections . 7,1 °/ Q 
Strongyloides infections . 28,5 °/ Q 
Oxyuris infections . 7,1 °/ 0 
The methods of examination used give a much higher propor¬ 
tion of infected individuals than those usually used in routine 
examinations and in the reported accounts of other investiga¬ 
tions, excepting those of Calvert (i), in India, and Ashford, 
King and Gutierrez (2). 
From autopsy material I hâve determined the presence of An- 
chylostoma duodenale and Necator americanus, Trichuris tri- 
chiura and Ascaris lumbricoides as the nematodes corresponding 
to the ova detected. 
From cultures I hâve identified S. stercoralis, and Oxyuris 
■vermicularis has been identified from stools. 
The persistence of hookworm infections, most of which were 
mild, illustrâtes how difficult it is to thoroughly rid the intes¬ 
tinal tract of this worm by the customary methods. 
The relative infrenquency of typhoid fever among the blacks 
in the Canal Zone compared with many towns and cities in the 
United States as well as the great rarity of appendicitis among 
the blacks here and the relative frequency of whipworm infec¬ 
tions in the same class of individuals, indicate that in this région 
among the blacks, the whipworm does not play any part in the 
causation of the diseases mentioned. On the other hand, I hâve 
little doubt that amoebic colitis may begin by the infection of. 
(1) Calvert (J. T.). Ind. Med. Gaz., Calcutta, 1900, v. 35, p. 385. 
(2) Ashford, King and Gutierrez, Report of the Corn, for the Study and 
Treatment of Anémia in Porto-Rico, San-Juan, P. R., 1900. 
