PREFACE. v 



tenkunde, Vol. XVIII, No. 2, 1909, p. 207, says: 

 " Since the publication of Schaudinn, Entamoeba 

 histolytica has been accurately described only by 

 Craig (1908), Werner (1908), and myself (1906- 

 1908), and Schaudinn's description thereby con- 

 firmed." As a matter of fact, I had confirmed Schau- 

 dinn's description and published my results in 1905, 

 and the paper referred to by Hartmann was only a 

 continuation of that paper. At the same time I was 

 able to follow the life cycle of both Entamoeba histo- 

 lytica and Entamoeba coli and to demonstrate the 

 truth of Schaudinn's description of the methods of 

 reproduction of Entamoeba histolytica. Regarding 

 my illustrations of the latter process, Hartmann 

 (ibid.) says: "On the other hand, he alone, until 

 now, has published illustrations of chromidial and 

 cyst formation which are capable of recognition," 

 thus confirming the accuracy of these observations. 



More recently (1910-1911) I have been able to 

 confirm the observations of Viereck and Hartmann 

 upon Entamoeba tetragena as regards its morphology 

 and life cycle, and have demonstrated the presence 

 of this species in patients suffering from dysentery 

 contracted in the Philippine Islands and in the United 

 States. 



In the following pages I have endeavored to give 

 a detailed description of the various species of amoebae 

 which have been described as parasitic in man, 



