97 



At 94°.4 3 



95° .4 4 



97°.l 2. 



A niaxiiiiiim was tliiis found at 95°. 4, viz. two decrees below 

 tlie melting point. 



15. The facts stated in § 14 exclude the existence of pseudo- 

 raonotropy, but we are able lo go a step farther and, from what 

 has already been stated as well as from the phenomena immediately 

 to be described, can conclude liiat sodium is monotropic. 



16. These phenomena are: The metal was cooled very slowly 

 in order to transform it into tiie «-modification. After this the dilato- 

 meter was kept at 97°. 22, a teni|)erature a( which melting began. 

 (At 97°. 12 melting does not take place). Table III gives the results: 



TABLE III. 

 Temp. 97^.22 (= 5=.998 on Beckmann's thermometer). 



The metal having been melted and chilled (the metal was now 

 present in the /^-modification) the dilatometer was brought back to 

 97°.22. Table IV gives the results: 



TABLE IV. 

 Temp. 97^.22 (= 5^.998 on Beckmann's thermometer). 



'^''"'P- "Hem'"'"*'''''' ' '^''"^ (minutes) 



Level in mm. 



5°998 

 5.998 

 5.998 

 5.998 

 5.998 







5 



31 



51 

 76 



266 I) 



275 



309 



326 



344 



') In order to use the same part of the capillary lube, the meniscus was brought 

 lu Ihc .■<aine puinl of I ho scale as with the experiments mentioned in Table III. 



7 

 Proceedings Royal Acad. Amsterdam. Vol. XVUI. 



