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Mean displacements of lines towards the less refrangible end of

the spectrum are certainly revealed by statistical investigations

of the fixed stars; but up to the present the examination of the

available data does not allow of any definite decision being

arrived at, as to whether or not these displacements are to be

referred in reality to the effect of gravitation. The results of

observation have been collected together, and discussed in detail

from the standpoint of the question which has been engaging our

attention here, in a paper by E. Freundlich entitled "Zur Prufung

der allgemeinen Relativitats-Theorie" (_Die Naturwissenschaften_,

1919, No. 35, p. 520: Julius Springer, Berlin).