20 



THE MICROSCOPE. 



Feb., 



near the edge of the drop, where the liquid is shallow 

 and its movements are not so active. Notice that it is 

 shaped something like a snake, with one end rounded a 

 little, Fig. 5. These eels do not have a true head or any 

 organs of sense, but are like worms. After the vinegar 

 has evaporated somewhat, a few may be seen curled up 

 and quiet. Carefully add just a small drop of the vine- 

 gar and watch them. Soon they begin to move, at first 

 very slowly, then they become active again. 



Turn the stage over the dark back-ground and look at 



the drop without the lenses. The eels can be seen moving 

 about as little white specks. This shows how much more 

 can be seen by careful observation after one has learned 

 what to look for. 



These animalcules are also found in sour paste. If the 

 paste in which they are seen be allowed to dry up and 

 then after a long interval a small piece is added to some 

 fresh paste, in a day or two the whole mass will be 

 swarming with these creatures. 



Another species is found in wheat affected with "cockle." 

 If a grain of this wheat, which looks like a black pepper 



