THE AMCEBA. 
197 
undergoing disintegration in shallow pools or streamlets they 
may be successfully sought for, and especially in the slimy 
matter that often coats half decayed submerged leaves ; but 
they appear to perish in putrescent water. 
The observation of these atoms is sufficiently simple, since 
their slow locomotion makes it a much easier process than 
that of investigating the active Polygastrica or Rotifera. A 
common live box — such as is used for other animalcules — 
serves every purpose. By scraping off a little of the surface 
from decaying vegetation taken out of the water, and placing 
it in the live box, the student will rarely fail in dis- 
covering some form of Amoeba ; but the same end will be 
answered by placing the material in question on any glass 
plate along with a drop of water, and covering it over with 
another piece of thin microscopic glass. 
INDEX TO THE PLATE. 
Fig. 1. Amoeba princeps. After Carter. 
ec. Ectosarc ; v. Villose region ; n'. an older and oval nucleus. 
en. Endosarc ; n. nucleus ; c. Contractile vesicle. 
„ 2. Amoeba princeps; s.Eeproductive granules (Sarcoblasts?). AfterCarter. 
„ 3. Amoeba feeding upon an Acineta. After Wallich. 
n. Nucleus ; c. Contractile vesicle. 
a. Portion of Acineta ; d. portion of Acineta being incepted ; 
/. v. food vacuole containing fragment of Acineta. 
„ 4. Amoeba investing a Pinnularia prior to becoming encysted. After 
Wallich. 
„ 5. Amoeba already encysted. After Wallich. 
s. Sarcoblast. 
„ 6. Sarcoblast in early stage of development. After Wallich. 
„ 7. Ditto ; n. Nucleus ; c. Contractile vesicle. 
„ 8. Ditto ; c'. Contractile vesicle preparing to burst through sarcode. 
,, 9. Ditto ; v. Incipient villose region. 
„ 10. Granular nucleus showing the capsule c. After Wallich. 
„ 11, 12, 13. Crystalloid bodies. After Carter. 
„ . 14, 15, 16. States of Amoeba radiosa ; in 14 /. v. and 16 /. v\ are in- 
cepted Diatoms. 
„ 17. Amoeba Guttula, with nucleus but without contractile vesicle. 
„ 18. Ditto; n. Nucleus ; c. Contractile vesicle. 
„ 19. Amoeba princeps with numerous reproductive granules, as at s ; v. 
Villous extremity ; c. Contractile vesicle. 
In all the above figures ec. means ectosarc, en. endosarc, n. nucleus, c. con- 
tracting vesicle,/, v. food vacuole, v. villous region, s. sarcoblast. 
