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Article Contents

TITLE PAGE

1.DEFINITIONS

2.REMARKS ON THE HISTORY OF THE SUBJECT

2.1.A. Small Groups of Galaxies

2.2.Clusters of Galaxies

2.3.Recent Advances

2.4.Instrumentation

3.WIDELY SEPARATED INTERCONNECTED GALAXIES

3.1.The Triple System IC 3481, Anon, IC 3483

3.2.KEENAN's System

3.3.Another Remarkable Filamentary Structure

3.4.WILD'S Triple Galaxy

3.5.The Basic Types of Structures

3.6.Some Conclusions

4.LONG EXTENSIONS AND SPURS OF SINGLE AND OF MULTIPLE GALAXIES

4.1.NGC 4038-4039

4.2.NGC 750-751

4.3.A System in Leo

4.4.NGC 4651 and Dwarf Companion

4.5.NGC 3628 and Faint Extensions

4.6.Spiral Galaxy with One Long Arm

5.SOME SPECIAL PROBLEMS

5.1.The Milky Way System and the Magellanic Clouds

5.2.The Andromeda Nebula and its Companions

5.3.New Clues on the Sense of Rotation of Spiral Galaxies

5.4.Multiple Galaxies in Clusters and in the General Field