gases ; distinguishing th 



54 



[To face p. 32. 



Crimson. 



B. A. 



67 68 69 70 71 72 73 74 75 76 77 



rum is not given in Kir chho 



5555555644 



1 2 1 4 



rays recorded by Kirchho: 





 1 

 5 

 7 

 10 

 13 



54 



ire that was afterwards taken. 













1 











2 



3 















3 

























6 



4 











1 



2 













3 



3 



2 







6 



1 











7 













8 



9 



6 



4 



4 



2 











2 





4 







1 



10 



4 



7 



10 



8 



7 



2 









2 



6 



10 



8 



6 



2 



4 



7 



1 



1 







16 67 



68 



69 



70 



71 



72 



73 



74 



75 



76 



77 



or next after it. 



