252 K IKEDA 



The Atomic constants (a* b' c') for the various elements used in 

 the calculation of the second table are as follows : 

 for carbon 44 when there is no double linking. 

 „ hydrogen 21.5 in all cases. 

 „ oxygen 31 in alcohols* 



44 when combined with two carbon atoms. 

 55 when connecting a carbon atom to a benzene ring, 

 chlorine 119 when only one atom of chlorine is united with a 



carbon atom, 

 chlorine 110 when two or more atoms of chlorine are united 



with a carbon atom, 

 bromine 162 when only one atom of bromine is united with a 



carbon atom, 

 iodine 215 when only one atom of iodine is united with a 



carbon atom, 

 nitrogen 54 in all cases where it is a triad. 



55 55 



11 11 



11 



JJ 



55 



sulphur 148 when combined with two carbon atoms. 



When two atoms are united together by more than one bond, 

 the value of 7t F 1 ' ls is increased by 19 for each additional bond. 

 Thus : 



group ( N C = C / ) = 107 = 2x44 + 19 

 group ( X C7=0) = 118 =44+55 + 19 

 group (-C=tf)=*136=44 + 54 + 2xl9 



group (- i V = C = S)=284 = 44 + 54 + 19 + 148 + 19 



group (SCN) - 270 ) 



j-these have not been resolved. 

 group (NO,) =172 ) 



