1900] MICROSCOPICAL JOURNAL. 41 



ing out on both sides of the trough so that I was enabled 

 to study it readily as a £inch objective works through the 

 glass side of the trough. I watched it spreading itself 

 out. I saw a small fragmant, which was formless, not 

 branched. Its granules were attempting, as I may say, 

 to circulate like those of the large one for they were rest- 

 less. After a while the larger one touched the smaller 

 one and for a long time merely pressed against it and 

 about two-thirds surrounded it. Then one and at last 

 two points of union were formed, the granules of the 

 small one mixed with those of the large one and the two 

 became essentially one. I saw several clear ovoid beau- 

 tifully blue masses without any investing membrane car- 

 ried about in the current of granules. I tried to keep one 

 of them in sight to see if it would change but could not 

 do so. Afterward I found an ovoid mass which was ap- 

 parently similar, partly blue and partly green, with gran- 

 ules in it. I watched this and saw it become more and 

 more coarsely granular. The green larger granules in- 

 creased in number and at length nearly filled up the 

 ovoid mass thus replacing the blue granules, or the blue 

 granules became green. Then it began to loose color and 

 the granules at last became colorless. Then it began to 

 move, rolling over this way and that very actively. At 

 last it escaped from the Protista mass, by projecting part 

 of it beyond the Protista mass and sailed off, apparently 

 by means of cilia. On September 21, I again visited the 

 stream where I got the Protista and found several very 

 large ones, some covering a space from two to three inches 

 square. I scraped off portions of one of the largest, put 

 it into a bottle with water and in the evening it spread 

 itself up the side. I also brought home a stone with a 

 large one on it. Attached to the stones in the same stream 

 I found larvae of Psaphenus lacontei, also Polyzoan in 

 plenty. The Hydrodictyon has spread down the stream 

 and young are very plenty. Two days afterwards the 



