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Astronomy, 223 
(6.) Not unfrequently, in the case of stars of low altitude, besides 
the bands which are regular, there occur other series o 
? 
(7.) Under normal atmospheric conditions, neighboring stars all 
present the same phenomena. ‘ 
Under abnormal conditions of the atmosphere, the bands are 
more feeble and more irregular in form and movement. 
_(9.) When high winds prevail, the bands are very faint and in- 
distinct, and sometimes appear as mere changes eigen in 
ep gui even when the stars are near the horizon, and very 
10.) When the images of the stars are very diffuse, the bands 
are most feeble and indistinct. ; 
(11.) When the bands are regular in form and movement, there is 
generally good weather; and it would appear in general that 
regularity in the phenomena of scintillation is a reliable basis for 
predicting the continuance of fair weather. 
12.) The phenomena of scintillation are most distinctly marked 
on evenings of greatest atmospheric humidity. 
Prof. Respighi then discusses the cause of the scintillation as 
regularity and con- 
earth, by which the luminous rays are carried through atmos- 
pheric strata of varying densit 
