August ii, 1910] 



NATURE 



mark the first frost of the auUimii in the planet's southern 

 hemisphere. These patches were photogi'aphed, as were 

 also iiKiiiv of the canals. 



The number of the latter photographed at I'lagstaff since 

 1905 is between fifty and one hundred. 

 Boston, U.S..'\., July 2i. Pfkcival Lowell. 



NO. 2128, VOL. 84] 



