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illumination, and consequently the true nature of this remark- 
able object remains to be determined. Further information, 
therefore, must be obtained before a decision can be arrived at 
whether this crater of Dr. Klein’s is or is not a new formation. 
The great importance of this question is too obvious to need 
being pointed out, for it would immensely increase the import- 
ance of this branch of astronomy, and at once raise selenography 
into one of the most important fields of astronomical research as 
it is already one of the most interesting. Let it once be estab- 
lished that great physical changes in the conformation of the 
moon are still in active operation, and it would lead to the 
lunar surface being most assiduously studied. And as it has 
been well remarked by both the eminent selenographer Madler 
and the distinguished geologist Phillips, there is little doubt 
that the careful study of the features presented by the lunar 
surface would lead to most important discoveries being made as 
to the career, past, present and future, of not only our satellite 
the moon, but of its primary, the earth. 
