CONTENTS xi 



IX. Food Requirements and Other Factors Influencing 

 Growth of Protozoa in Pure Cultures By R. P. Hall, 



University College, New York University ... 475 



Food requirements of Protozoa — Photoautotrophic nu- 

 trition— Photomesotrophic nutrition — Photometatrophic 

 nutrition — Heteroautotrophic nutrition — Heteromeso- 

 trophic nutrition- — Heterometatrophic nutrition — Trophic 

 specialization — Specific growth factors, or vitamins — 

 Other growth factors — Growth stimulants — Growth in 

 cultures as a population problem — The initial popula- 

 tion — Growth in relation to waste products — Growth in 

 relation to food concentration — Growth in relation to 

 pH of the medium — Oxygen relationships — The redox 

 potential — Growth in relation to temperature — Growth 

 in relation to light and darkness — Acclimatization — 

 Literature cited 



X. The Growth of the Protozoa By Oscar W. Richards, 



Research Biologist, Spencer Lens Co?npany ... 517 



Methods for the measurement of growth — The growth of 

 individual Protozoa — The growth of colonial Protozoa — • 

 Pedigree isolation culture and life cycles — Protozoan suc- 

 cessions: nonlaboratory — Protozoan successions: labora- 

 tory — Autocatalysis and allelocatalysis — Nutrition and 

 growth — The growth of populations — The struggle for 

 existence — Literature cited 



XI. The Life Cycle of the Protozoa By Charles Atwood 



Kofoid, University of California, Berkeley . . . 565 



Introduction — Asexual reproduction in alternating binary 

 and multiple fission (Type I) — Alternation of asexual 

 and sexual reproduction (Type II) — The life cycle of 

 Eimeria schubergi — The life cycle of Plasmodium 

 vivax — ^The life cycle of Paramecium caudatum — Litera- 

 ture cited 



XII. Fertilization in Protozoa By John P. Turner, Univer- 

 sity of Minnesota 583 



Copulation — Gametic meiosis and fertilization — Autog- 

 amy — Zygotic meiosis — Significance of fertilization — 



