1894 THE MICKOSCOPE. 87 



stages of mosses. We can keep this in water and watch 

 it grow, but as it is in water it will never grow into a 

 moss. It wants to be kept out of the sun and just 

 moist, so that we can see it grow into a red stage, 

 wherein the cell contents become red colored. But in 

 this, it must be in the sun and kept in water. Besides 

 it must be kept cold. In winter such a stage is seen and 

 it goes by the name of Red Snow then. 



Let us now collect some of the green slime that is so 

 common on the surface of the water of both fresh water 

 and brackish swamps, and examine it by means of the 

 microscope in the same way. We shall flud it to be com- 

 posed of a mass of green things which we find to be indi- 

 viduals of a totally different character. Instead of being 

 at rest we shall find it extremely lively ; shooting about 

 in various ways are spheres and various shaped organ- 

 isms with a point in them of a light crimson elongated, 

 and with a cell-wall thin, but not so thick of white as the 

 Protococcus we have before seen and more visible and 

 not stiff as that. As they swim about they will be seen 

 to advance in the following manner. The front portion 

 will swell and the swelling will pass down across the 

 length of the creature without the creature itself ad- 

 vancing as quickly until the swelled part disappears and 

 is lost or passes off at the end. Another swelling will 

 appear on the advanced end and pass off in the same 

 manner. Another and another will appear and disap- 

 pear, and this takes place without the organism moving 

 onward at all. Now the organism will move with a re- 

 volving motion, slower than the appearance of the swell- 

 ings. If we look at the organism closely, we will see a 

 bright red spot at one end, the end that advances, look- 

 ing like an eye. In fact this was concluded to be an 

 eye, and the whole organism itself was thought to be an 

 animal, and was called Euglena, whih is now known to be 

 an organisms— neither animal nor vegetable, but Protista. 



