Contents. xi 
De l’interpolation des fonctions irrationnelles en general, et des 
fonctions logarithmiques en particulier, a l’aide des tables nume- 
riques. Par F. Lefort, inspecteur general des Ponts et chaussees, 
Membre Correspondant de l’Academie des Sciences de Naples, . 602 
The Theory of the Causes by which Storms Progress in an Easterly 
Direction over the British Isles, and why the Barometer does not 
always indicate real vertical pressure. By Eobert Tennent, Esq., . 612 
On Electric Images. By Professor Tait, .... 623 
Laboratory Notes. By Professor Tait — 
a. On the Origin of Atmospheric Electricity, . . . 623 
b. Experiments on the Thermal Conductivity of some Dialec- 
trics. By Messrs C. M. Smith and C. 0. Knott, . . 623 
A Chapter on the Tides. By the Eev. James Pearson, M.A., Vicar of 
Fleetwood. Communicated by Professor Tait, . . . 627 
Farther Researches in very perfect Vacua. By Professors Dewar and 
Tait, . . . . . . . .628 
On the Electric Resistance of Iron at a High Temperature. By Messrs 
C. M. Smith, C. G. Knott, and A. Macfarlane. (Plate), „ . . 629 
