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On the Physiological Action of Light. No. I. By James \ 
Dewar, Esq., and John G. M c Kendrick, M.D., of the 
University of Edinburgh, . . . .. 10d 
Monday , 5th May 1873 w 
Notice of two Fossil Trees lately uncovered in Craigleith 
Quarry, near Edinburgh. By Sir R. Ciiristison, Bart., 
President R.S.E., ..... 104 
On the Formation of Buds and Roots by the Leaves of the 
Ipecacuan Plant (Cephaelis Ipecacuanha). By Professor 
Baleour. (With a Woodcut), . . . v 108! 
On the Physiological Action of Light. No. II, By James 
Dewar, Esq., and John Gr. MTGendrick, M.D., . 110 
Monday , 19 tli May 1873. 
On the Thermal Influence of Forests. By Robert Louis 
Stevenson, Esq. Communicated by Thomas Steven- 
son, Esq., . . . . . 114 
Observations and Experiments on the Fluid in the Cavities 
of Calcareous Spar. By Dr James Hunter and Edward 
Sang, . . . . . . 126' 
On “Tait’s Property of the Retina.” By George Forbes, 
Esq., . . . . . •' r ;'. 130 J 
A Theory of Volcanic Eruptions. By Daniel Vaughan, . £ 133 , 
On the Placentation of the Sloths. By Professor Turner, . 1341 
Monday , 2 d June 1873. 
On the Anatomy of a new species of Polyodon, the Polyodon 
Gladius of Martens, taken from the river Yang-tsze- 
kiang, 450 miles above Woosung. Part II., being its 
Nervous and Muscular Systems. By P. D. Handyside, 
M.D., 136 
On the Placentation of the Seals. By Professor Turner, . 137 
Second Report by the Committee on Boulders appointed by 
the Society. (With a Plate), .... 137 
On the Physiological Action of Light. No. III. By James 
Dewar, Esq., and John Gr. M‘Kendrick, M.D., . 179 j 
On the Thermo-Electric Properties of Pure Nickel. By Pro- 
fessor Tait, . . . . . .182 
Notice of the Rayages of the Limnoria terebrans on Green- 
heart Timber. By David Stevenson, Esq., Civil 
Engineer, . . . . . 1 82 j 
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