1903.] LOWELL—THE CARTOUCHES OF MARS. 377 
———— 
Days before SS Ce Days after 
s30 o 70 60 #20 iv 
74 
+4 ; 
"20° 40° 60° 80° 100° 720” 140° 100° 180° 160° [40° 720° 100° 80° 60° go° 20° O° 
PHENOLOGY CURVES —EARTH. 
% = Oead Point of Vegetation. 
Plate XVII. 
ty 
PROC. AMER. PHILOS. SOC. XLII. 174. Z. PRINTED JAN. 25, 1904. 
