Ill 
PAGE 
On a Pre-Brachial Stage in the Development of Coma- 
tula^ and its importance in relation to certain Aber- 
rant Forms of Extinct Crinoids. By Professor 
Allman, . . . . .91 
Donations to the Library, . . . . 91 
Monday, 2d March 1863. 
Letter from Sir D. Brewster relative to the specimens 
of Topaz with Pressure Cavities presented by him 
to the Museum of the Society, . . . 95 
On the Polarization of Bough Surfaces, and of Sub- 
stances that reflect White or Coloured Light from 
their Interior. By Sir David Bkewster, K.H., 
F.B.S., . . . . . . 96 
On a Clay Deposit with Fossil Arctic Shells, recently 
observed in the Basin of the Forth. By the Bev. 
Thomas Brown, F.B.S.E., . . . 96 
On the Bemarkable Occurrence of Graphite in Siberia. 
By Thomas C. Archer, Esq , . . • 97 
Donations to the Library, . . . ‘ . 99 
Monday, \Qth March 1863. 
On the Polarization of the Atmosphere. By Sir David 
Brewster, K.H., F.B.S., . . . 100 
Concluding Note on the Star Observations at Elchies. 
By Professor C. Piazzi Smyth, . . .100 
On a new fossil Ophiuridan, from Post- pliocene strata of 
the valley of the Forth. By Professor Allman, 101 
Donations to the Library, . . . . 104 
Monday, Qth April 1863. 
Accompanying Note to Portions of Lead from the Boof 
of the Lower Storey of Nelson’s Monument, injured 
by Lightning on the evening of 4th February 1863. 
By Professor C. Piazzi Smyth, . . .105 
Note on the Anatomical Type in the Funis Umbilicalis 
and Placenta. By Professor Simpson, . . 112 
On Earth-Currents during Magnetic Calms, add their 
Connection with Magnetic Changes. By Balfour 
Stewart, Esq., M.A., F.B.S. Communicated by 
Professor Tait, . . . , .112 
