22 ELEMENTARY BIOLOGY. [CHAP. 



d. Foreign bodies (swallowed) ; Diatom cases, Des- 

 midice, &c. 



4. Movements : 



a. Watch the process of formation of a pseudopo- 



dium. A hyaline elevation at first ; then, as it 

 increases in size, currents carrying granules flow 

 into it. 



b. Locomotion : watch the process, a pseudo- 

 podium is thrown out, then the rest of the 

 body appears to flow up to it, and the process 

 is repeated. 



c. If the opportunity presents itself, watch the pro- 

 cess of the ingestion of solid matters. 



d. [Observe the movements on the hot stage ; warmth 

 at first accelerates the movements, but as the tem- 

 perature approaches 40 C. they cease, and the 

 whole mass remains as a motionless sphere.] 



e. [Effects of electrical shocks on the movements.] 



5. Mechanical Analysis: crush. The whole collapses, 

 except sometimes the nucleus, and even that after a 

 time disappears : there is no trace of a distinct 

 resisting outer sac. 



6. Chemical Analysis : Treat with magenta and iodine. 

 The whole stains, and there is no unstained envelop- 

 ing sac. Iodine as a rule produces no blue colora- 

 tion ; when blue specks become visible it is probable 

 that the starch which they indicate has been 

 swallowed. 



7. [Look for encysted specimens: and for specimens which 

 are undergoing fission.] 



