35 LEON AUGUSTUS HAUSMAN. 



PLATE I. 



FIG. i. Aquarium jar culture oven, a, thermometer; b, cardboard cover; 

 c, aquarium jar; d, cultures; e, iron tripod; /, lamp; g, copper wire rack for lamp. 



FIG. 2. Isolation pipette. 



FIG. 3. Growing slide, a, sponge, for absorbing excess water; b, cover glass; 

 c, glass tube carrying thread, as siphon; d, lower half of glass vial, cemented to 

 the slide with balsam, as reservoir. 



FIG. 4. Vorticella microstoma, encycted. 



FIG. 5. Unusually large Amoeba proteus, with body filled with minute nuclei. 



FIG. 6. Proteus, resting before extrusion of the apseudopodiospores. 



FIG. 7. Extrusion of the apseudopodiospores. 



FIG. 8. Immobile, globular apseudopodiospores. 



FIG. 9. Proteus after extrusion of the apseudopodiospores. 



FIG. 10. Active apseudopodiospores. 



FIG. ii. Apseudopodiospores during the stage when they resemble Amceba 

 gultula. 



FIG. 12. Small proteus stage. 



FIG. 13. Amoeba radiosa stage. 



FIG. 14. Apparent transitional forms between the radiosa and the Dactylo- 

 spha:rium stages. 



