1902.] 



LOWELL — AREOGRAPHY. 



229 



lo. A very different set of phenomena stamps the advance made 

 in the second period. Over the bright portions of the map is now 

 drawn a network of fine lines. The dark patches remain as before. 

 These singular lines are what are known as the '^ canals " of Mars. 



Fig. 4. 



DegrescteSiongitucte 



i7T-v<-~^;vy^T /^jp^n:^'^^^ T^TT-Tc-i^ 



bore a/e3 



Map resume, by Flammarion, 1876. 



Fig. !^. 



Map of Schiaparelli, 1877. 



II. The second period was the work of Schiaparelli. Of it are 

 here given four maps, all that he made on Mercator's projection. 



