Survey of Biological Progress

Embryological Concepts in the Twentieth Century

I. Introduction

II. The Whole Embryo

III. The Embryo as Constructed of Germ Layers

IV. The Embryo as Constructed of Cells

V. Some Concluding Fancies

References

Trends in Systematic Botany

I. Introduction

II. Taxonomy and Classification

III. Two Centuries of Floras

IV. The Tools of Systematic Botany

V. Anatomy

VI. Pollen Morphology

VII. Seed Morphology

VIII. Embryology

IX. Paleobotany

X. Parasitism

XI. Biochemistry

XII. Cytogenetics

XIII. Cytology

XIV. Genetics

XV. The Genus Layia

XVI. Apomixis

XVII. Hybrid Complexes

XVIII. Conclusion

References

Some General Problems of Chromosomal Evolution and Speciation in Animals

I. Introduction

II. Cytotaxonomy and Population Genetics

III. Chromosome Structure and Rearrangements

IV. Evolutionary Increases and Decreases in Chromosome Number

V. Fusions of Sex Chromosomes

VI. Chromosomal Polymorphism and Speciation

References

Chemoreception and the Behavior of Insects

I. Introduction

II. Host-Finding and Recognition by Parasitoid Insects

III. Chemical Trail-Following

IV. Orientation by Flying Insects

V. Mating Behavior: Drosophila

VI. Mating Behavior: Cockroaches

VII. Conclusion

References

On the Mechanisms of Action of Hormones on Cells

I. Introduction

II. Insulin

III. Adrenaline

IV. Thyroid Hormones

V. Estrogens and Progesterone

VI. General Considerations

References

Respiration and Cellular Work and the Regulation of the Respiration Rate in Plants

I. The Regulation of Respiratory Rate

II. Regulation of Respiration Rate in Plant Tissues

III. Physiological Aspects of Rate Regulation

IV. The Climacteric

V. Conclusion

References

Author Index

Subject Index