14 
a) 
SMITHSONIAN MISCELLANEOUS COLLECTIONS 
HAIGIina reneR TTT 
TRL 
CEE 
LITEREERERRUTAGISE 
HALENEMERLIS 
HINHERERADD> canal 
EL ber TTT 
en 
= 
10 
gen. B, Synthesis of four periods, multiples -of 273 
C, Curve B reduced to “%o in ordinates. 
months, 
Fic. 6.—Glacial penetration in Germany. A, Soergel’s curve as smoothed by Griinha 
