8i8 
Proceedings of Societies . 
[December, 
III. Sun-spot Inequalities of the period of twenty-four days, 
as far as this may be obtained from existing records. 
The various results of the present communication are summed 
up as follows : — 
1. The temperature-ranges at Kew, Utrecht, and Toronto ex- 
hibit certain common periods (around twenty-four days). 
2. Of the curves embodying those periods that of Kew is most 
like the mean, and that of Toronto least so. 
3. Similar phases occur at Toronto eight days before they 
occur at Kew, and occur at Kew one day before they occur 
at Utrecht. 
4. Correcting for these differences of phase, the individual in- 
equalities of Kew, Utrecht, and Toronto are very like the 
mean of the three, and like each other. 
5. Of these the Kew inequalities are most like the mean, and 
the Toronto least so. 
6. The declination-ranges at Kew and Prague exhibit certain 
common periods which we may regard as the same, or 
very nearly the same, as the meteorological periods above 
indicated. 
7. Similar magnetic phases occur at Kew about one day before 
they occur at Prague. 
8. Correcting for this difference of phase, the individual ine- 
qualities at Kew and Prague are very like the mean of the 
two, and like each other. 
9. There is also a less striking likeness between the various 
magnetical and the corresponding meteorological ine- 
qualities. 
10. Provisional sun-spot records appear to show certain solar 
inequalities very like the magnetic and meteorological 
inequalites in point of period. 
In conclusion, the authors express the hope that steps will be 
taken to ascertain what information exists in the world available 
for these researches, and also to bring such information together 
for the purpose of a further and more complete discussion of the 
laws now indicated. 
“ On the ACtion of Nuclei in producing the Sudden Solidifica- 
tion of Supersaturated Solutions of Glauber’s Salt,” by Charles 
Tomlinson, F.R.S. The author states the general conclusions 
at which he has arrived since resuming the study of this subjeCt 
two years ago. In his former papers a nucleus is defined as a 
body that has a stronger adhesion for the salt, or for the liquid 
of a solution, than subsists between the salt and the liquid. 
The acftion of nuclei the author believes to be simply mechanical, 
and to be expressed by the familiar word adhesion. 
“ On the Normal Paraffins,” Part III., by C. Schorlemmer, 
F.R.S. Mr. Schorlemmer is inclined to believe that petroleum 
consists chiefly of an inextricable mixture of isomeric and homo- 
