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Article Contents

TITLE PAGE

1.INTRODUCTION

2.EARLY CLASSIFICATION OF GALAXIES

3.DEVELOPMENT OF THE MODERN SYSTEM

3.1.Early Isolation of the Types

3.2.The Early Hubble System

3.3.Hubble's Major Modification Between 1936 and 1950

3.4.Finer Subdivision Along the Sequence

4.REVISION BY DE VAUCOULEURS

4.1.Extension of the Sequence Beyond Sc

4.2.Transition Between Ordinary and Barred Spirals

4.3.The r and s Varieties

4.4.Graphical Representation of the Classification

4.5.Additional Features of the de Vaucouleurs Revision

5.SELECTED ILLUSTRATIONS OF GALAXY TYPES

5.1.Elliptical Galaxies

5.2.Spirals with Thin Filamentary Arms

5.3.Spirals with Massive Arms

5.4.Transitions Between Sa and Sb

5.5.Pure Barred Galaxies

5.6.Sdm, Sm, and Im

5.7.Ir II Galaxies

5.8.Interacting Galaxies

6.VAN DEN BERGH'S CLASSIFICATION

7.MORGAN'S CLASSIFICATION BASED ON THE LUMINOSITY CONCENTRATION OF THE SPHEROIDAL COMPONENT

8.SYSTEM OF VORONTSOV-VELYAMINOV

9.COMPARISON OF THE CLASSIFICATION SYSTEMS

10.SEYFERT GALAXIES, N GALAXIES, AND QUASARS

11.STELLAR CONTENT RELATED TO TYPE: FORMATION AND EVOLUTION

REFERENCES