NUMBER OF GENERATIONS PER YEAR. 65 
O CD 
O 
oooooooo»o / _ N Jz; 
o c: o o oococc"^ 
ocoocoown^MtL-iofTti'* 
c:cOOO!^l'* , -* l '^^^^•*■ 
• ■ oocccococooooocL-jc^jjNN^tBnio 
: :-© I 
MOOONa'*OOOT)iNCL0 05«NN'3"*OHC!C«10Nffil.'5ffiNOmiOC»00«OlOMN!MOH(NCfflmLOCCrJH 
C!M«cc«NNocxxx«cc-N«ocx^r.«XKc;«a;xxN^r.c:s-r.sr.c:r.;xc; cr. — - cr. cr. s; ~ . c. — - c^ 
■ c; ri c-j ri ci 5'i ?i n r"i ?) :•? re 
26675°— Bull. 110—12 5 
