NUMBER OF GENERATIONS PER YEAR. 



67 



0000000<N 



OOOOOhhhhNMNhhNN 



OOOOOrtNIN^WHNNMnONINO 



OOOOOOOOi-li-l(M I -HT-lr-(<MrHi-HrH(N>-I^HOOOOOOOOOOOO 







•C 



OOOOOOOOOOCO^H--H(NOi-H 



1 





























































NOHHO 



1 

























































































1 



















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































3 



W 



