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,v 



CONTENTS. ^^ 



The following table is a synopsis of the subjects treated and the order of 

 treatment; for more detail subjects, genera, and authors cited, see the general 

 index and bibliographj- at the end of the book. 



CHAPTER I. 



Introduction. 



Distribution of Protozoa 23 



General Organization of the Protozoan Body 27 



A. Form-relations of Protozoa 29 



1. Protoplasmic Consistency 29 



2. Membranes, Shells and Skeletons as Form-determining Factors 31 



3. Mode of Life 33 



4. Mode of Reproduction and Form 35 



5. Inheritance 38 



B. Protoplasmic Structure 39 



C. Plastids of the Protozoa 46 



1. Chromatin 46 



2. Chromidia 48 



3. Volutin Grains 49 



4. Chondriosomes 49 



5. Chromoplastids and Pj-renoids 50 



D. Metaplastids of the Protozoa 50 



Special Bibliography 55 



CHAPTER II. 



Nuclei ant) Kinetic Elements. 



1. The Nuclei of Protozoa 56 



(a) Chromatin 58 



(b) Linin 66 



(c) Membrane 67 



(d) Plastin 67 



(e) Nuclear Sap or Enchylema 68 



2. Multiple and Dimorphic Nuclei 68 



3. Kinetic Elements 74 



(a) Intranuclear Kinetic Elements (Endobasal Bodies) .... 75 



1. Large Homogeneous Endobasal Bodies 76 



2. Endobasal Bodies with Centrioles 76 



3. Nuclei with Pole Plates and without Endobasal Bodies . 81 



(b) Extranuclear (Cytoplasmic) Kinetic Elements 83 



1. Blepharoplast, Basal Body and Centriole 84 



2. Parabasal Body and Blepharoplast 92 



3. Other Cj-toplasmic Kinetic Elements 101 



4. Nuclear Division and the Problem of Chromosomes 112 



(a) Cliromatin and Chromosomes 114 



Special Bibliography 125 



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