In the foregoing pages I have reported: 1. The behaviors of the organism differ in the different media of the culture. 2. The swarmspores respond to diffuse light negatively, unless it is not too weak. 3. The sense of reaction to light may be subjected to change by certain external agents. 4. The convection current due to the difference of temperature in the different parts of the culture medium gives rise to a peculiar phenomenon, that is the migration of an immense number of swarmspores grouping in vertical columns from the surface of the medium to the bottom of the flask. This phenomenon was explained as a manifestation of negative rheotaxis. The significance of this phenomenon in hydrobiology in nature was suggested. 5. The positive chemotactic activity of the organism was demonstrated by experimentation with the acidic chemicals. It was suggested that it may have some biological importance to the nutrition of this organism in nature. 6. The morphological accounts of the present organism were given and the pectin nature of the cell-membrane was pointed out.