•v 



Qd 





/Ji- 



TABLES 



1. Structural components of the fibrillar system of Paramedmn 196 



2. Rate of locomotion of Amoeba proteus in sodium and cal- 



cium salt solutions 338 



3. Sensitivity of respirometers 354 



4. Measurements of protozoan respiration 362 



5. Division rates of Protozoa with constant conditions . . . 528 



6. The effect of hydrogen-ion concentration on the growth of 



Protozoa 540 



7. Breeding relations in Chlamydomonas paradoxa and C. 



pseudoparadoxa 672 



8. Breeding relations in Chlamydomonas sp. [coccifera?), C. 



braimii, C. dresdensis, C. eugametos, and C. pauper a . . 673 



9. Grades of sex reaction in mixtures of sexes G to O from 



the Chlan2ydomonas species C. hraunti, C. dresdensis, and 



C. etigametos 675 



10. System of mating relations in Chlamydomonas hraunil, C. 



dresdensis, and C. eugametos. Observations and inter- 

 pretations of Moewus 680 



11. Results of mixing together animals from different cary- 



onides of stock F, Paramecium aurelia 692 



12. The system of breeding relations in Paramecium aurelia . 693 



13. The system of breeding relations in Paramecium hursaria . 695 



14. Environmental modifications, Chlamydomonas debaryana . 722 



15. Early results of selection for low and high numbers of 



spines, Difflugia corona 727 



16. Later results of selection for low and high numbers of 



spines, Difflugia corona 727 



17. Inheritance of spine length, with regression toward the 



mean, Difflugia corona 728 



18. Inheritance of mating types in Paramecium bursaria . . . 759 



