Manchester Memoirs , Vol. liii. ( 1 908), No. 3. 5 



some cases, however, a distance relation may not exist. 

 CI often appears to possess this peculiarity in certain 

 states of combination. 



The different types of relations between atoms and 

 the equivalent number of conditions to be satisfied are 

 considered in the following table. The number of 

 degrees of freedom of various molecules are then calcu- 

 lated on the supposition that 



the Carbon atom has 7 degrees of freedom since its valency is 4 

 Hydrogen „ 4 „ „ „ „ i 



Chlorine „ 4 „ „ „ „ j 



We shall denote the total number of degrees of 

 freedom of the molecule by n. 



Nature of Cojmection 

 Simple bond 



Double bond 



Triple bond 



Quadruple bond... 



Simple bond without a 

 distance relation .. 



Number of Conditions. 

 3 

 .S 

 7 



Two distances equal ... 



s distances equal 



Two planes parallel ... 



Two planes the same ... 



H = 



a--. 



H 



H 



