113 



too and tliis gave a deviating value for the distance between the 

 diffracting particles. This is evident from the following table. Here 

 (p is again the half top angle of the cone formed by the ditfracted 

 Röntgen rays, iltf and d have been written for the molecular weight 

 and densitj, while 



a = 



7,12 X 



■ V 

 4n- sm - 



denotes the distance between the diffracting particles. Here we again 

 have made the assumption that the observed diffraction ring is due to 

 the cooperation of arbilraiily orientated systems each of two particles 

 at that distance from each other. 



Instead of formulating a special hypothesis on the deviating 

 behaviour of CS, we prefer to postpone this until more substances 

 showing a similar deviation have been investigated. 



The diffraction rings obtained now are sharper than the former 

 ones, the liquids being radiated this time in a tube of 1 mm. 

 diameter. 



^ 4. Results of the observations on the second ring. On six plates 

 of oxygen and on those of argon and nitrogen the second ring is 

 distinctly measurable. The other plates do not show this ring, probably 

 because the obtained films are less blackened. For argon too this 

 ring is very weak. 



8 



Proceedings Royal Acad. Amsterdam. Vol. XXVI. 



