IV 
Monday , 6 th May 1872. 
. - • - PAGE 
On the Chemical Efficiency of Sunlight. By James Dewar, 
Esq., ....... 751 
On the Bain fall of the Continents of the Gflobe. By Alex¬ 
ander Buchan, Secretary of the Scottish Meteorological 
Society, ...... 755 
On the Lunar Diurnal Variation of Magnetic Declination 
at Tre van drum, near the Magnetic Equator. By J. A. 
Broun, F.B.S., ..... 756 
Monday , 2 Oth May 1872. 
Some Helps to the Study of Scoto-Celtic Philology. By 
the Hon. Lord Heaves, . . . ~ .758 
Some Observations on the Dentition of the Narwhal (. Mono- 
don monoceros). By Professor Turner, . .759 
On the Occurrence of Ziphius cavirostris in the Shetland 
Seas, and a comparison of its Skull with that of 
Sowerhy’s Whale (Mesoplodon Sowerbyi). By Professor 
Turner, . . . . . .760 
On the Maternal Sinus Vascular System of the Human 
Placenta. By Professor Turner, . . . 760 
Monday , 3 d June 1872. 
On Dimorphic Flowers of Cephaelis Ipecacuanha , the Ipeca- 
cuan Plant. B}^ Professor Balfour, . . . 763 
On the Crinoids of the “ Porcupine ” Deep-Sea Dredging 
Expedition. By Professor Wyville Thomson, . 764 
Laboratory Notes. By Professor Tait— 
On Thermo-electricity: Circuits with more than one 
Neutral Point. (With a Plate), . . . 773 
On a Method of Exhibiting the Sympathy of Pendulums, 779 
On Some Quaternion Integrals. Part II. By Professor 
Tait, ....... 784 
On the Currents produced by Contact of Wires of the same 
Metal - at Different Temperatures. By W. Durham, 
Esq. Communicated by Professor Tait, . . 788 
Bemarks on the Deep-Water Temperature of Lochs Lomond, 
Katrine, and Tay. By Alexander Buchan, A.M., . 791 
Donations to the Society, . . . . .796 
Index, ....... 821 
