427 



instance we found again reliable \ alues with : diti/u/In/alonate (—20") 

 and butyl-, or iso/>n(i/i-ci/tinoacet(tfcs ( — 22°). 



Tiieretbre we thinly it right to draw^ the conclusion, that the noil- 

 linear dependence of / on the temperature, must be connected with 

 the venj nature of the surface-enen/i/ itself, and tlutt it ir ill manifest 

 itself aboays, as soon the studied temperature-interval is only ivide 

 enough. 



We can also mention here the fact, that in the case of 

 molten salts, even at very high teiiiperatin-es and with vQvy small 

 viscosities of these liquids, we observed just the same three types of 

 •/-^curves: so with potassiumiodide the type 3, with potassium- 

 metaphosphate the type J, with many others the rectilineal- type 2, 

 — without it being possilde to indicate an immediate reason for it. 

 Finally we can draw the attention to the fact, that notwithstanding 

 the fact that these determinations range over a much smaller tem- 

 perature-interval, some x-^curves of other experimenters (vide e.g. 

 GuYE and his collaborators) show, on better consideration, also clearly 

 a deviation from the rectilinear type; for water this has moreover 

 already been mentioned before. 



§ 7. Finally it is here the place to discuss some points connected 

 with the relations between the magnitude of [i and the chemical 

 constituents of the studied liquids, in so far as we may draw con- 

 clusions about it already with respect to the sparing experimental 

 data. Moreover the investigations relating to this subject will be 

 continued in this laboratory in a quite systematical way, because a 

 great number of problems have risen iti this respect, which only by 

 collecting a more extended experimental material can be answered 

 by generally acceptable views. The facts hitherto gathered are 

 principally adapted, to bring the values of [x in cjualitative connect- 

 ion with the homology of some analogous compounds, and with the 

 ?)Ubstitution-i'Q\i\{'mns between sotne organic derivatives. This can be 

 executed best by comparison of the f-l-^diag•rams, which were published 

 in the successive communications. 



A. Homology. 



Of homologous series we can mention the following: 



Ethylalcohol. I Ethylformiate. 



Ethylacetate. 

 1,) n.-Propylalcohol. '^'[Ethylacetate ^' Amylacetate. 



IsobutylalcoJw!. 



