PLATE YIl. 
n 
% \ 
NRALL, 
g u r\ 
iN THR FIVE DECADES, 134;-C|0, 
shown BYTriufR VARJATiON FROM THE 50"YEARS MEAN- 
JAW FEB- MAR- A?R r.';AV JUW. JULY Ai.Ki SER 00" NOV- DEC. YEAR, 
