646 



Tlie difference between any two of these determinations ne\'er exceeded 

 three nnits in t!ic third decimal place. 



Our thermomt^ters had been compared with a standard of the 

 Phys. Techn. Reichanstalt at Cliarlottenburg — Berlin. 



We nsed toluene as the liquid in tlie pycnometer ; its density had 



25°.0 

 been determined in four experiments to be d — — 0.8603. 



4 



Two different parts {A) and {E) of our material gave the values 



25°.0 G.6900 [A) ard 



4° 6.6897 (£•). 



5. Tiie samples {A) and [E) were now heated separately during 4 X 24 

 hours in an aqueous solution of potassium chloride (10 gr. KCl on 

 JOO gr. of water), using a reflux condenser, the boiling point of the 

 solution being 102°. 5. 



The metal was then washed with dilute hydrochloric acid, water, 

 alcohol and ether, and dried in vacuo over sulphuric acid. 

 Its density was now 



25°.0 6.6744 (A) 



4° 6.6803 (£■); 

 ConseqHiently the density has decreased by 13 units in the third 

 decimal place. 



6. After having heated {A) and {E) for a second time (6 X 24 

 hours) in the boiling solution, we found : 



25°.0 6.6784 a-d G.6765 {A) 



^ 4° 6.6789 and 6.6778 {E). 



Tlie density had undergone no further change. 



7. The experiments described in % 4—6 show that the antimony 

 after chilling is present in a form which changes at 100° with a 

 measurable velocity. 



In order to investigate if there exists here a transition tempera- 

 ture as in the case of the other metals which ^ve have hitherto 

 studied, we carried out some dilatometric measurements, using the 

 electric thermostat which we described formerly. ^) 



8. The material which was put into the dilatometer consisted of 

 small pieces of the metal mixed up with fine powder and a part of 

 the metal from the pycnomelers. (500 grams). The paraffm oil used 

 had been heated for some time at 200° in contact with finely divided 

 antimony. There was no evolution of gasbubbles. 



9. At temperatures below 119° there occurred no change of the 

 meniscus at the first heating (the bore of the capillary tube was 



i> Zeitschr. f. physik. Chemie 87, 409 (1914). 



