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Porter, A. 



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in human dysenteric faeces. Lancet, 1916, I, 1166-1169. 

 Prowazek, S., and Werner, H. 



1914. Zur Kenntnis der Flagellaten. Arch f. Schi£fs-und Tropenhyg., 18, 



Beiheft 5, 155-170, pi. 10, 1 fig. in text. 

 Reuling, F., and Rodenwaldt, E. 



1921. Giardia-Lamblia. Arch f. Prot., 42, 336-346, 2 figs, in text. 

 Schaudinn, F. 



1903. Untersuehungen iiber die Fortpflanzung einiger Ehizopoden (Vor- 

 laufige Mittheilung). Arb. Kais. Gesundh., 19, 547-576. 

 Simon, C. E. 



1921. Giardia enterica; a parasitic intestinal flagellate of man. Amer. Jour. 

 Hyg., 7, 440-491, pis. 22-24, 2 figs, and 12 curves in text. Dated 

 July, published in November.* 

 Stiles, C. W. 



1915. Intestinal infections. The school grades attained by 2166 white 



school children (1062 boys, 1104 girls) in the city of X, classified 



by age, sanitation and intestinal parasites. U. S. Public Health 



Reports, 30, pt. 2, 2060-2067. 

 Wenyon, C. M. 



1915. Observations on the common intestinal Protozoa of man. Lancet, 



1915, II, 1173-1183, 1 pi. 

 Wenyon, C. M., and O'Connor, F. W. 



1917. Human intestinal Protozoa in the Near East (London. Wellcome Bur. 



Sci. Research), 1-218 pp., 4 pis., 5 figs in text. 



* Dr. C. E. Simon's article on "Giardia enterica, a parasitic intestinal flagel- 

 late of man," in the July number of the American Journal of Hygiene (pub- 

 lished in November) was received while this article was in press, so that it has 

 not been feasible to incorporate herein a discussion of points raised by his 

 divergent interpretations. A paper dealing with these will appear later. 



