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1. Also atoms that are not directly bound to each other, exercise 
an action on each otber in the same molecule. 
2. The saturated non-cyclic molecules exeeute, among others, 
movements in which the parts of the molecule revolve in opposite 
direction or with different velocities round the single bonds as axes. 
In case of not uniform load, as is the case in by far the most 
molecules (excepted are only H,,0O,, N, ete. C,H,, C,Cl,, perhaps 
oxalic acid, ete.) the movements are irregular, because the most 
stable position of the atoms will be passed most frequently. 
3. In the saturated ring-shaped molecules with six and seven 
carbon atoms the ring-forming atoms are not fixed in one plane, 
but they lie tension-less in a curved surface, which travels through 
space in undulatory movements. 
Delft, October 1921. 
