: 
Astronomy. 319 
d. 
e limit of mean diameter may be roughly placed at zy that 
ivi at 7 that of 
the earth. Since the total mass must be an appreciable fraction 
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dence of at least the possibility that a group of many thousand 
isible . 
thesis of the zodiacal light is subject to the same difficulties with 
the sun or of his atmosphere, or of the matter in his interior, oo 
produce the observed effect. The reply to this would be that the 
