THE SIDEREAL UNIVERSE. 



717 



M. Stanislaus Meunier in his remarkable lecture on the ge- 

 ology of the moon. Evidence of this fact seems to be fur- 

 nished by the large clefts or furrows which are observed in 

 the surface of this body, and which have sometimes a 



200. Craters on the Moon's Surface, at Sunset. After Julius Schmidt. 

 a Clavius, b Maginus, c Tycho, d Longomontanus. 



breadth of more than three quarters of a mile, and a 

 length of 150 miles. These clefts, according to M. Lecoq 

 de Clermont, are the result of the absolute cooling of the 

 mass of the planet. 



Formerly, the dark patches which cover part of the 

 moon's surface were considered as representing lunar seas, 



