70 



A CHEMICAL SIGN OF LIFE 



9.11 



PQ ^ H 



< a s 



If! 



<J 



u 2 

 S *g 



&si 



il 



M MbO 

 S S g 



d ri d 



's 's "g 



8 4J i 



"3 "3 "3 "3 

 ^ -I -I -i 



^3 J3 ^3 r3 



OC/3OC/3O C/2OCO 



O JJ 



^c^-a^ 



'III 





i'? 



ii 



s'i 



i 1 . 



" 



* 



Hi 



I ? 



ill 



2.S a 

 .^^6 



S^^ 



>-S& 



4! 



II 



