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Article Contents

ABSTRACT

1.MASSES FROM LUMINOSITIES OF NEBULAE

2.MASSES FROM INTERNAL ROTATIONS OF NEBULAE

A.Model of a nebula whose "internal viscosity" is negligible

B.Model of a nebula whose internal viscosity is very great

C.Actual nebulae

D.Further discussion of the rotation of nebulae

3.THE VIRIAL THEOREM APPLIED TO CLUSTERS OF NEBULAE

4.NEBULAE AS GRAVITATIONAL LENSES

5.STATISTICAL DISTRIBUTION IN SPACE OF DIFFERENT TYPES OF NEBULAE

6.THE COMA CLUSTER OF NEBULAE

7.COMPARISON OF THE THREE METHODS