89 



§ 3. The results obtained are reviewed in tlie Tables I--XXIV 

 above, while the relations of the corresponding ft-^curves can be 

 seen from the fig. 1 — 3. 



Molecular Surface-Energy 

 H in Erg pro cm''. 



ffSO 

 020 

 g90 

 S60 

 S30 

 SCO 



rw 



7'tO 

 710 

 6S0 

 650 

 6W 

 590 

 560 

 530 

 600 

 4!0 

 iiO 

 'llO 

 3S0 

 360 

 320 

 Z90 

 260 



■80' TO'-eo'SO'-iO' sa-ze" lO" o' /o'xr30'4a'jo-éo'xr M'9o-//>a-//o-/x-/j(r/f{r/st>-/fi(r Temperature 

 Fig. 2. Secondary Amines. 



From these experiments it a[)pears in the first instance, that the 

 substitution of iZ-atoms in the ammonia-molecule by hydrocarbon- 

 radicals, makes the surface-energy of the liquid compounds at the 

 same temperatures increase regularly ; and that, — pecularities left 

 out of question, — that increase goes in general parallel to the 

 augmentation of the number of C- and //-atoms. That however, 

 even with tiie same number of 6- and //-atoms, the special con- 

 figuration of the molecule plays an important role in this, can soon 

 be seen: e.g. the (^-^curves for {C^HS)NH^ are not only situated 

 above those for {(JB^^N, etc., but it is also quite clear from fig. 1 — 3 

 that genevalhj in the case of correspondingli/ built-up isomer amines, 

 those luith normal hydrocarbon-chains generally possess at any tem- 

 perature a greater surface-tension than those with ramified hydrocarbon- 

 chains; and that generally the surf ace-tension of such isomerides under 

 the same conditions appears to be the loioer, the more ramified the 

 hydrocarbon-chains are (e.g. butyl-, isobutyl-, and 3"'"^ butyl-amines; 

 in the same way the corresp. amylvniius between 10° and 70°; etc.) 



