132 PROCEEDINGS OF THE ACADEMY OF [PaRT I 



The capsule is now nearly complete, and its walls soon will grow 

 thicker; but one thing is wanting, namely the neck, or rather its 

 widened border; and now- — if two observations, both agreeing, 

 suffice for the statement — the difficulty is removed in a very in- 

 genious way. The animalcule lengthens somewhat, then bends 

 first to one side (Plate VII, fig. 35), then to another side, leaving 

 some material behind, acting in fact like the finger of a potter 

 about to broaden the aperture of a cup, but here the displacements 

 are exceedingly slow, very likely because, before leaving the con- 

 tact portion of the border, the animalcule must wait till the de- 

 posited film is hardened. 



From my observations, the construction of the capsule takes a 

 long time, from morning to evening; but it is quite possible that 

 in nature things go much quicker, owing to more favorable con- 

 ditions. 



Chrysamoeba radians Klebs. Plate VII, figs. 41-44. 



Chrysamoeha radians, which Klebs described in 1892 (21), is not 

 rare, and yet remains Uttle-known; every observer has seen it, but 

 very few have gone to the trouble of studying it at length. This 

 study, it must be said, is little encouraging in itself, doubts and 

 uncertainties are met with on many points, contractile vesicle, 

 chromatophore, flagellum, division, capture of food, even the very 

 existence of this Flagellate as a distinct species has been doubted, 

 and so many little organisms are met with, whose study looks more 

 profitable, that this particular one is easily neglected. 



Scherffel, in 1901 (29), treats in a few pages of this little organ- 

 ism, and says in regard to the flagellum: "Besides the pseudopodia 

 a swinging flagellum is sometimes seen, probably only when the 

 amoeba is about to change to the Flagellate state, but as a rule there 

 is none." A little further on, he says concerning animal feeding: 

 "Klebs was not able to observe the capture of foreign bodies, and 

 Senn says, in 1900, holozoic nutrition has not yet been observed. 

 Yet in 1890 I had observed in a vacuole a little rod with the appear- 

 ance of a Bacterium. This year in the spring I was able to verify 

 the direct capture of green Algae and the evacuation of brown 

 undigested remnants of food." Later on, in 1911 (30) the same 

 observer, in his chapter under the title "Chrysamoeha and Chromu- 

 lina nehulosa," seems to doubt his former observations about a 

 flagellate stage, thinking the observed Flagellates might not have 

 belonged to Chrysamoeha. "1 consider more and more as probable 



