CONTENTS 



PAGE 



FOREWORD v 



AUTHOR'S PREFACE vii 



INTRODUCTION 1 



History of the Study of Yeasts. . . '. 3 



CHAPTER I 

 MORPHOLOGY AND DEVELOPMENT OP THE YEASTS 



1. General Characters of Yeasts; the Different Phases in Their Development. 5 



2. Forms of Yeast Cells 6 



3. Mycelial Formations 8 



4. Cell Division 9 



a. Budding 9 



b. Transverse Division 10 



5. Durable Cells 12 



6. Sporulation 13 



7. Sexuality 15 



a. Copulation Preceding the Formation of the Asc 15 



b. Copulation of Ascospores or Parthenogamy 23 



c. Retrogradation of Copulation Parthenogenesis 25 



8. Germination of Ascospores 29 



a. Direct Germination of Ascospores in Asc 35 



CHAPTER II 

 CYTOLOGY OF YEAST 



1. General Considerations; Historical 37 



2. The Nucleus 38 



3. The Cytoplasm and Its Different Constituents 39 



a. Metachromatic Corpuscles 39 



b. Glycogen 43 



c. Basophile Granules 44 



d. Fats 44 



4. The Membrane 45 



5. Changes in the Cell during Fermentation 46 



6. Cytological Phenomena during Vegetative Multiplication 47 



7. Cytological Phenomena of Sporulation 48 



ix 



