March. 1915. 



KNOWLEDGE. 



79 



Figure 65. Elysium. Drawing bv Dr. Lowell in.ide 

 on 21st January. 1914. ..\perture 40 inches. 



hlGL'KE 66. Elysium. By Mr. E. C. Slipher on 

 21st January. 1914. .\perture 40 inches. 



Figures 65 and 6G are two drawings of Mars made with t!ie full aperture of the 40-inch reflector at Flagstaff on the same evening by 

 Dr. Lowell and .\Ir. E. C. Slipher respectively. It is evident from the discrepancies that the canals were not seen with the greatest 

 facilitv. With regard to the vertical double canal in the centre of the disc. Mr. Slipher. when the drawings were afterwards compared, 

 admitted that he liad drawn the double too wide. Lowell, by comparing it with " .\menthes." is nearer the truth, thougli he thinks he 

 erred on the side of narrowness. Lowell probably had th^ best seeing on thatfnight, as his drawing seems more accurate when compared 

 wit!i the mass of observations which have been made with suitable apertures. — J. E. M. 



Figure 67. Mars. 11th January, 1914, by Dr. Lowe 

 Aperture 24 inches. Magnification X 392. 



Figure 6iS. 



Mars, 5th January, 1914, 12,45 a.m.. by 

 Mr. W. H. Steavenson. 

 .Aperture 10 inches. Power X 300. 



Figures 67 and 6S were made within a few days of each other— Figure 67 by Professor Lowell at Flagstaff, using full aperture of 24-iiich 



refractor, and Figure 6S by Mr. Steavenson. using the full aperture of the I'O-inch refractor at Mr. Worthington's observatory in Hants. 



England. It will be observed that everything appearing in .Mr. Steavenson's drawing may be found also on Dr. Lowell's drawing. 



There can thus be no doubt but that at least the canals appearing in Figure 68 are objective. — J. E. M. 



