Tue Microscope. 57 
night, however, while examining a drop of water from a large 
tank in my greenhouse, I found a very large specimen, #s of 
an inch in diameter, which I examined with a one-fifth object- 
ive and with 2-inch, 1 inch, and }4-inch eye-pieces, of best make. 
When I first saw it, it was in the position shown in Figure 1. 
Its flagella was in very active motion most of the time, and 
was probably twice as long in proportion as the drawing shows. 
While I was looking, suddenly, and without the slightest warn- 
ing, it disappeared backward beyond the field of view by an 
impulsive jerking motion. I immediately followed it up and 
found it in position and shape shown by Figure 2; but in two 
or three minutes it had again assumed the shape shown in 
Figure 1. Its flagella was in constant motion. Time and again 
it disappeared and changed shape. The large nucleus 1s of a 
light brown color, with a highly refractive nucleolus in centre. 
Immediately forward of, and partly under the nucleus there 
seemed to be another nucleus. Surrounding the nucleus were 
many green cells, with an open free place in the rear of the 
nucleus. Greenish lines seemed to be produced by folds in the 
outer covering, and ran longitudinally, but following the out- 
