277 



from the above RANKiNE-BosE-formula the 



Calculating ( — ) 



following values are found for the heat of sublimation expressed in 

 calories per gramme of substance at the various observation 

 temperatures 



In concluding' I am glad to express ra}^ hearty thanks to Professor 

 H. Kamërlinüh Onnes for his continued interest in my work. 



19 

 Proceedings Royal Acad. Amsterdam. Vol. XVII. 



