FLAGELLATA I 3 5 



the I'hial up against the Light, resembling very small Bladders 

 or Air Bubbles, and are in all Places of it from Top to Bottom, 

 but mostly towards the Top, where they assemble when the Water 

 has stood still some Time, unless they have been killed by keep- 

 ing them too long in the Phial. Placing one of these Animal- 

 cules before a good Microscope, an exceeding minute Worm may 

 be discovered, hanging with its Tail fixed to an opake Spot in a 

 Kind of Bladder, which it has certainly a Power of contracting 

 or distending, and thereby of being suspended at the Surface, or 

 at any Depth it pleases in the including Water.' " 



" The above-mentioned Phial of Sea Water came safe, and 

 some of the Animalcules were discovered in it, but they did not 

 emit any Light, as my Friend says they do, upon the least Motion 

 of the Phial when the Water is newly taken up. He likewise 

 adds, that at certain Times, if a Stone be thrown into the Sea, 

 near the Shore, the Water will become luminous as far as the 

 ]\Iotion reacheth : this chiefly happens when the Sea hath been 

 greatly agitated, or after a Storm." Obviously what Mr. Sparshall, 

 Baker's correspondent, took for a worm was the large flagellum. 



The chief investigators of this group have been Huxley, 

 Cienkowski, Allman, Biitschli, and G. Pouchet, while Ischikawa 

 and Doflein have elucidated the conjugation. 



