PARAM(JiCIUM 



285 



granules derived from ingested food, vacuoles of water, and a 

 dense though transparent, spherical or ellipsoidal l)ody, the 

 nucleus, which it is often difficult to make out on the living 

 animal' The whole substance of the Amceba is mobile, so 

 that the internal organs have no fixed relation to one another. 

 Quantities of Amoel)a can usually be obtained for study by 

 gathering the mud from the edges of stagnant pools, or by 



.„^U^^^^^'^^4^ 



Fig. 271. — Euglena viridis, a lash-animalcule. A-D, four views illustrating 

 the characteristic movements ; E and H, enlarged views of adult ; F, 

 outline of anterior end further enlarged ; G, resting stage ; cy, cyst ; fl, fla- 

 gellum ; vi, mouth; nu, nucleus; ce, gyllet ; pg, pigment spot; r, reser- 

 voir. After Kent and Klebs. 



scraping the green growth from flower-pots and letting these 

 gatherings, covered with a little water, stand in a fairly warm 

 place for two or three weeks. 



The second class is that of the spore animalcules, or Spo'ro- 

 zoa. This class includes some of the worst parasites among 

 the Protozoa. Here belong the germs of "malaria" and a 

 host of related diseases occurring almost exclusively in the 

 tropics. The Sporozoa are minute, rod-like organisms. They 



1 Fig. 270. 



