184 NEEB. 



of the segmenting form, the staining reaction with respect to Giemsa's 

 solution, the kind and color of the pigment, the absence of Schuffner's 

 dots, the fact that the infected chromocytes are neither enlarged nor 

 faded, and the lack of further tertian forms such as rings, amoebic 

 forms, and gametes. In order to confirm the preceding view, namely, 

 the inadmissibility of tertian parthenogenesis by comparison, I have 

 added figs. 4 and 5, drawn with a magnification of 950 diameters. 

 These specimens were prepared in an analogous manner and were 

 stained with Giemsa's solution like the preparation represented by figs. 

 1, 2, and 3, with the difference that they were stained for a shorter time. 



Fig. 4 demonstrates the first stage, where the light-blue protoplasm is 

 separated very distinctly to the right and left. The former is the Rest- 

 horper, containing the expelled protoplasm destined to degenerate, a 

 small chromatic' mass, and a small quantity of pigment. The right 

 side includes a spindle-shaped chromatic band, in which there may 

 already distinctly be observed a differentiation in the form of the darker 

 granules, for the subsequent segmentation of the chromosomes. 



Fig. 5 represents the final stage of the parthenogenesis. The Rest- 

 horpev is to be found situated in the upper left-hand comer with a 

 certain amount of marginal, violet-red, chromatic substance. In the 

 lower right-hand quadrant may be seen a light-blue sporular form, with 

 eight chromatic particles destined for the young parasites. The Resthor- 

 per and segmenting form are very clearly discerned in both illustrations. 

 Furthermore, a very marked enlargement and irregular, angular meta- 

 morphosis of the red blood cells may be distinguished in both of the 

 figures. The cells exhibit beautiful examples of Schuffner's dots. Both 

 forms of parthenogenesis were obtained from two of my blood slides 

 made at Koeta-Eadja two and a half years ago. These I submitted for 

 verification to Von Prowazek, Mayer, Eodenwaldt, and Gonder, of the 

 Institut fiir S drift's und Tropen-Krankheiten at Hamburg. These 

 observers confirmed my own conclusions. 



It only remains to decide whether the forms illustrated in figs. 1 

 and 2 result from schizogenesis or parthenogenesis of the tropical para- 

 site. I had an opportunity of comparing my blood slides with a long 

 series of very characteristic schizogenesis of the tropical parasite at the 

 Institut fiir Schiffs und Tropen-Krankheiten at Hamburg. The differ- 

 ences are very important and are as follows : 



