﻿334 COLE. 



this case than in any other which had been examined in the preceding 

 six months. Three or four ova could be observed in the field at one time 

 when the § objective was used. A very few Uncinaria were recovered in 

 the first stools after the administration of thymol ; two days later, follow- 

 ing a course of thymol, about ninety were obtained and ova were 

 not found again until fifteen days had elapsed, when, after a third course 

 of the drug a large number of Uncinaria (possibly fifty) were again 

 recovered. No more ova were encountered in the stools of this patient. 

 The Uncinaria obtained from this case corresponded quite closely in 

 measurements to those given by Stiles 3 for the variety of Uncinaria 

 described by him and to which he has given the name Uncinaria ameri- 

 cana (Necator americanus).* When examining the female of this 

 variety the position of the vulva was noticed as one of the first things 

 differentiating Necator from Agchylostoma. In all the specimens ex- 

 amined it has been found to be near the anterior one-third of the body. 

 (PI. I, figs. 1 and 2.) From these facts it appears that the specimens 

 are Necator americanus. In the meantime, similar Uncinaria had been 

 recovered from other patients. The medical publications reaching Ma- 

 nila during the progress of this work established the fact that Necator 

 americanus had been identified in material from Guam and China. 5 



As interest had been aroused by the supposed finding of Necator 

 americanus in natives of the Philippine Islands, great care was taken 

 to secure as much material as possible for comparison. In addition to 

 the patient mentioned above, seven other Filipino and two American sol- 

 diers have been found to harbor this parasite. The stations of these 

 soldiers were widely separated and in different islands of the Archipel- 

 ago as follows: four from the same station as the case just referred to, 

 two from the Island of Samar, another from the city of Manila, one 

 American soldier was sent to this hospital from the Island of Guimaras. 

 the other from Camp Daraga. Luzon. Xo less than five hundred Unci- 

 naria have been collected from these cases. 6 



The structures which are constantly present and unmistakable in 

 these Uncinaria, which resemble Necator americanus more than they do 

 any other of the Strongi/loida>, were thought to be of sufficient importance 



3 P. H. & M. H. S. Bull. (1903), Xo. 10. 



*A Young Stage of the American Hookworm — Necator Americanus (Stiles 

 1902)— 8 to 12 Days after Skin Infection in Eabbits and Dogs. Stiles and Gold- 

 berger, Am. Med. (1906). 11, 63. 



"Bull. Johns Hopkins Hosp. (1906), 17, 313. 



Photomicrographs and cameva-lucida drawings have been made of a number 

 of specimens, to assist in demonstrating the presence of the newly described organs 

 not found in the descriptions or illustrations by Stiles; whereas the apparently 

 new organs, or their homologues, were illustrated by the same author in Agchy- 

 lostoma duodenale. (After Schulthess (copied from Blanchard).) 



