CERCOMONAS HOMINIS 53 



observed in the intestine of man by Escherich, also by Cahen, 1 

 Massuitin, 2 Fenoglio, 3 Councilman and Lafleur, 4 Dock, 5 Kruse and 

 Pasquale, 6 Zunker, 7 as well as Quincke and Roos. 8 However, 

 it is an open question whether the Flagellata observed by Roos 9 

 in one of his cases belonged to Davaine's species, the size shows 

 some deviation (0-014 o - oi6 mm.). In this, as in many other 

 cases, doubts have been raised as to whether the Flagellates 

 found in the stools had actually lived in the intestine, or had 

 subsequently appeared in the faeces : for this a surprisingly 

 short time only is necessary. Salomon also appears to have 

 observed Cercomonades (Berl. klin. Wchschr., 1899, No. 46). 



As with Trichomonas vaginalis so with Cercomonas hominis, it 

 appears that the parasite settles not only in the intestine but 

 also in the air-passages ; this is demonstrated by the statements 

 of Kannenberg 10 and Streng H of the occurrence of Monades and 

 Cercomonades in the sputum and putrid expectoration in gan- 

 grene of the lungs, which no doubt apply to Cercomonas hominis 

 (cf. also Artault). 12 Possibly also the Flagellata observed in the 

 pleural exudation by Litten 13 and Roos 14 may be here included ; 

 this is the more probable in Roos's case, as here the process ensued 

 in the pleura after the breaking through of a vomica. Perroncito 15 

 and Piccardi 16 describe the encysted stages of the Cercomonades. 



1 Cahen, " Ueber Protoz. in kindl. Stuhl " (Dcutsch. med. Wochenschr., 1891, No. 27, 

 P- 853). 



2 Massuitin, " Amceben als Parasiten des Dickdarms." (Wratsch., 1889, No. 25 ; Cen- 

 tralbl. fiir B. und P., 1889, vi., p. 451). 



3 Fenoglio, " Enterocolite par Amoeba coli " (Arch. ital. d. med., 1890, xiv., p. 62). 



Councilman and Lafleur, " Amoebic Dysentery " (Johns Hopk. Hasp. Ref>., ii., 

 P- 395)- 



5 Dock, " Observations on Amoeba coli in Dysentery," (Daniels' Texas Med. Journ., 

 1891, p. 419). 



Kruse, W., and Pasquale, " Unters. ub. Dys." (Ztschr. f. Hyg., 1894, xvi., p. i). 

 Zunker, " Ueb. d. York. v. Cere. int. im. Dig. d. Mensch." (Dtsch. Ztschr. f. pr. 

 Med., 1878, p. i). 



Quincke and Roos, " Ueb. Amceb.-Enter." (Berl. kl. Wchschr., 1893, p. 1089). 

 Roos, E. " Ueb. Infus.-Diarrhoe " (Dtsch. Arch. f. kl. Med., 1893, li., p. 505). 

 * Kannenberg, " Ueb. Infus. im Sputum 1 ' (Vir chow's Arch. f. path. Anat., 1879, 

 Ixxv., p. 471 ; Ztschr. f. kl. Med., 1880, i., p. 228). 



11 Streng, W., " Infus. i. Sput. bei Lungengansran " (Fortschr. der Med., 1892, x., 

 P- 757)- 



12 Artanlt, St., " Flore et faune d. cav. pul." (Arch, de paras., 1898, i., p. 278). 



13 Litten, " Ueb. Hydropneumothorax " (Verh. d. Congr. f. inn. Med., 1886, p. 417). 



14 Roos, E., " Ueb. Infus.-Diarrhoe " (Dtsch. Arch. /. kl. Med., 1893, li., p. 505). 



15 Perroncito, E., " Ueb. d. Art d. Verbreitg. d. Cere, infest." (C. f. B. u. P., 1888, iv., 

 p. 220 ; Arch. ital. d. biol., 1888, x., p. 257 ; Ann. R. Ace. d'agric., Torino, 1889, xxxii.). 



16 Piccardi, " Ale. prot. d. fed dell' uomo " (Giorn. R. Ace. d. med., Torino, 1895, 

 Iviii., i ; Progr. med., 1895, p. 377) 



