S2l 

 Tlie fio-iii'cs show that there has occiin-ed at 15° an incrensa of 



o 



17 units in the third (h^cinial ))hi('e. 



20. We put the metal again into the solution whieli was kept at 

 50° (in a thermostat) for J 20 hours. We found after wasiiing and 

 drying 



•25° 

 (/ — 11.3J3, (Pvcnometer 6') 



11.312, (Pycnomeler D). 



Tiie density had di'crfiisi'd 28 units in the third decimal place. 



21. The experiment was re[)ealed again, this lime at 25°. (in a 



thermostat) toi' 144 hours. 



25° 

 We found: d 11.327- (Pvcnometer (') 



11.329, (Pycnometer D). 



An uici'i'iis(' (tf 15 \iints in the third decimal place had occurred. 



22. Our table I contains the results of these determinations: 



T A B L E I. 



.25° 



Without any previous treatment \ 11.324 



After treatment at 15° j 11.341 



„ 50° 11.313 



„ 25° 11.328 



B. Measurements loitli the dilatometer. 



23. This investigation was carried out in the same way as has 

 been described in the case of cadmium ^). 



Some kilograms of lead were melted in a spoon and poured out 

 into an iron form. The metal cooled in contact with the air. After 

 fding it we treated it with a magnet and put it into the solution of 

 the acetate. Here it remained (at 15°j for 15 X 24 hours. After this 

 it was washed and dried in the way described above. We used 

 ± 600 grams in the dilatometer. (Bore of the capillary tube 1 mm.). 



1) Proceedings 16, 485 (1913); Zeitschr. f. physik. Chemie 87, 409 (1914). 



