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g , „ 
IV 
Monday , 2 d June 1879. 
On the Carboniferous Volcanic Bocks of the Basin of the 
Firth of Forth : their Structure in, the Field and under 
the Microscope. Second Paper. By Professor Geikie, 232 
Additional Observations on the Fungus Disease affecting 
Salmon and other Fish. By A. B. Stirling, Assistant 
Curator of the Anatomical Museum of the University 
of Edinburgh. Communicated by Professor Turner, . 232 
The Form and Structure of the Teeth of Mesoylodon 
Layardii and Mesoplodon Sowerbyn. By Professor 
Turner, M.B., . . . . . 250 
Monday , MSth June 1879. 
Atomicity or Valence of Elementary Atoms : Is it Constant 
or Variable? By Professor Crum Brown, . . 252 
Action of Heat on some Salts of Trimethylsulphine. By 
Professor Crum Brown and J. Adrian Blaikie, D.Sc. 
Ho. IV., . . . . . 253 
Comparison of • the Salts of Diethylmethyl-sulphine and 
Ethylmethylethyl-sulphine. By Professor Crum Brown 
and J. Adrian Blaikie, D.Sc., . . . 254 
On the Bursting of Firearms when the Muzzle is closed by 
Snow, Earth, Grease, &c. By Professor George Forbes, 254 
On some Hew Bases of the Leucoline Series. Part III. By 
G. Carr Bobinson and W. L. Goodwin, . . 256 
Monday , 17 th July 1879. 
Hotice of Striated Bocks in East Lothian and in some 
adjoining Counties. By David Milne Home, LL.D., . 256 
On Methods in Definite Integrals. By Professor Tait, . 271 
Measures of certain Badiometer Constants. By Professor 
Tait, . . . . . . 272 
Further Besearches on Minding’s Theorem. By Professor 
Tait, . . . . . . .' 272 
On the Transmission of Sound by Loose Electrical Contact. 
By James Blyth, M.A., . . . . 272 
Monday 21 st July 1879. 
Presentation of Makdougall-Brisbane Prize to Professor Geikie, 272 
The Solar Spectrum in 1877-8 ; with some Idea of its 
Probable Temperature of Origination. By Piazzi 
Smyth, Astronomer Boyal for Scotland, . . 274 
On another Method of Preparing Methylamine. By B. 
Milner Morrison, D.Sc,, . . . . 275 
On the Composition of “ Beh,” an Efflorescence on the Soil 
of certain Districts in India. By J. Gibson, Ph.D., . 277 
On Spherical Harmonics. By Professor Tait, . . 280 
Proposed Theory of the Progressive Movement of Barometric 
Depression. By Bobert Tennent, F.M.S., . . 280 
On the Solution of the Simultaneous Equations — ax + by — c, 
dx + ey =/, when the symbols denote qualities. By 
Alexander Macfarlane, D.Sc., . . . 283 
List of Donations to the Library, . . V . 285 
