627 



XVII. 



XVIII 



para-Nitro-Monomethylaniline : C'g «^4 . (NHCHs\i). ^02(4). 



<u 



Maximum Pressure // 



in mm. mer- 

 cury of 

 0° C. 



in Dynes 



Surface- 

 tension xin 

 Erg pro cm'-. 



Specific 

 gravity d^o 



Molecular 

 Surface- 

 energy // in 

 Erg pro cm^. 



155.2 



170 



186 



199 



210 



1.525 

 1.469 

 1.440 

 1.373 

 1.324 



2032.7 

 1958.2 

 1919.7 

 1830.3 

 1765.7 



46.3 

 45.2 

 43.7 

 41.5 

 40.1 



1.201 

 1.189 

 1.175 

 1.165 

 1.156 



1167.5 

 1147.5 

 1117.5 

 1070.5 

 1037.2 



Molecular weight: 152.08. Radius of the Capillary tube: 0.04644 cm. 



Depth : 0.1 mm. 



The yellow crystals, which possess a beautiful pink lustre, melt at 152° C. 

 Above 190° the liquid becomes gradually darker tinged; therefore the mea- 

 surements were no longer continued. The specific gravity at 160° C. was: 

 1.1968; at 180° C. : 1.1807; at 200^ C. : 1.1643. At / C. : f/40 = 1.2049— 00008125 

 (t — 150'^). The temperature-coefficient of y increases very rapidly with rise 

 of temperature: from 1.3 Erg at 155-^ C. to 3.3 Erg at 210° C. Evidently the 

 above mentioned decomposition must be considered the cause of this 

 phenomenon. 



