The Mechanism of Cycles 



121 





c3 



c 



TO 



a 

 a> 

 t-. 



>- 



a> 

 CO 



i 



o 



o 

 'C 



u 



a 



XD 



"o 

 !>> 



c 



X 



I 



X 



CD 



a 

 o 



i- 



a; 



$ 





8 



•spujjj. jp/nois 3Aijjdd?jj JiaL/t luojj. S33ud /pjjujpjo xapui si/Jjo pup 

 sdosjjo jjjp jjd p/?iA jo xjpui dLjjjo spjjuijAoui /e^'/o/s /ej#ud$ ji/4jo suoi./.pja9q 



CO 



O 



CM 



K 

 OS 

 



o 



