415 
INORGANIC COMPOUNDS, (continued). 
Es | SE lS as) 
35 ete  |sssles8s 
Chemical Compound : eS 395.5) Kn: ley = (BSE Kp 
Sa Pos sal #55 
ER Ea A 
Zil 83| (ESS Se 
KE ON AAN I et ee 
: Kie oe ai iz The TAR 
Rubidiumsulphate 1347 10.73 “2.04 
| | 
Rubidiumnitrate 579 8.91 2.24 
Caestumfluoride 953 6.03 0.96 — 
Caestumchloride 919 6.60 1.20 
Caestumbromide | 909 | 5.42 | 1.27 
Caesiumiodide | 894 4.80 | 1.39 
| Caesiumsulphate | 1292 | 7.59 | 2.13 | 
Caestumnitrate | 687 | 6.78 | 1.92 || 
_ Thallonitrate | 479 4.89 | 2.69 
means of the so much more extensive experimental material at our 
disposal now’). For the purpose of easier comparison these experi- 
mental data are subdivided into four groups: the first group includes 
all substances, where the mentioned rule, as far as it concerns the 
hoiling-temperature, seems to have indeed an approximative validity ; 
it contains 121 compounds. The second group concerns those organic 
liquids, where the value of Ay, is appreciably smaller, and 16 liquids 
are dealt with; whife in the third group 14 liquids are collected, 
for which the mean value is much greater than 1,15. Finally in a 
fourth group we have dealt with 48 inorganic compounds and 
metallic salts. 
§ 4. If now we review the results of these calculations, it 
appears first of all once more, that no complete “law”, but only 
an approximative rule is present here. In the first group the mean 
value of Kp is 1,12, and for Km it is 3,88; thus the mean value 
at the meltingpoint is three times that at the boilingpoint. In 
12 or 17°/, of the cases considered, dealing with 121 substances 
for the boilingpoints, and 118 for the meltingpoints, there are rather 
appreciable deviations from this mean value stated: at the boiling- 
2y 
1) The number for a? therein is calculated from: ‘ at the melting-, or boil- 
okt 
ingpoint. 
