83 
Ordinary Meeting, April 1st, 1879. 
Edward Schunck, Ph.D., F.R.S., &c., Vice-President, in 
the Chair. 
Among the Donations announced was a Portrait of Mr. 
E. W. Binney, F.R.S., &c., painted by Mr. William Herbert, 
Johnston, and presented by the President, Dr. J. P. Joule, 
F. RS., &c. 
On the motion of Dr. R. Angus Smith, F.RS., seconded 
by Professor W. C. Williamson, F.R.S., it was resolved That 
the cordial thanks of the Society be given to Dr. J oule for his 
valuable donation. 
Mr. J. H. Poynting, B.A., exhibited an autograph dedica- 
tion to M. Humbolt, of “Extrait d’un mdmoire sur la 
Thdorie des tubes capillaires,” by M. Laplace, of which the 
following is a copy : 
Pour Monsieur Humbolt. De la part de l’auteur. 
Je prie Monsieur Humbolt d’agre'er ce petit mdmoire 
comme un hommage de tons mes sentimens d’estime et 
d’attachement bien sinceres. M. Berthollet, qui est avec 
moi dans ce moment, me prie d’y joindre les siens. 
Nous nous rappellons l’un et l’autre au souvenir de M. 
Gay Lussac. 
“Two Deductions from Mr. G. H. Darwin’s Letter in 
Nature , Feb. 6, 1879, upon Sir W. Thomson’s Equation of 
Cooling, 
* = V 0 + 
2V 
X 
— -Z 
2 Jkt 
dz 
by Mr. James Heelis. 
Proceedings — Lit. &Phil. Soc. — Yol. XVIII. — No. 10. — Session 1878-9. 
