917 



Physics. — ''Magnetic researches. XIV. On paramagnetism at loio 

 temperatures \ (Continuation of VII). By H. Kamerlingfi Onnes 

 and E. Oostkkhuis. (Jommunication N". 13iK^ from the Piiysical 

 Laboratory at Leiden. Communicated by Prof. H. Kamerlingh 



Onnes. 



§ 15. Ferrous sulphate. (Continuation of III § 2). The measurements 

 of the susceptibility of pai-ama^iietic substances at low temperatures 

 were continued according to the method previously described. 



Crystallized ferrous sul|)hate, which had been already investigated 

 by Kamerlingh Onnes and Perriek (Comm. N". 122a), was once 

 more very carefully prepared, by precipitating it out of its aqueous 

 solution with alcohol. The values of the susceptibility found do iu)t 

 entirely correspond to the previous ones, but the dependence on the 

 temperature is precisely the same, as is shown by the following 

 table, when compared with table II of Comm. N". \22a, 



TABLE XII. 



Crystallized ferrous sulphate FeS04 • "71^20 

 precipitated with alcohol. 



§ 16. Palladiuiv. Pure palladium (from Heraeus) gave the 

 following figures: (see |>. 918) 



Palladium, it will be seen, deviates markedly from Curie's law. 

 Curie found just for this substance the law /. 7'= const, fairly well 

 confirmed. Honda ^) (above ordinary temperature) and Owen -) (below 

 ordinary temperature down to, 100° K.) found deviations from Cuiue's 



1 

 law which agree very well with our results. The line — =/'(7') 



1) K. Honda. Ann. d. Pliys. 32, p. 1027, 1910. 



2) M. Owen. Ann. d. Phys. 37, p. 657, 1912. 



