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WIT: 
Vill. 
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XI. 
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XIII. 
XIV. 
CONTENTS. 
Description of Harbour Screw-Cramps, for temporary 
use in binding together the Stones in the Con- 
struction of Harbour or other Marine Works. 
By Tuomas Stevenson, Esq., Civil Engineer, 
F.R.S.E., F.R.S.S.A. (With a Plate.) Com- 
municated by the Royal Scottish Society of Arts, 
On the Motion of a Lava-Stream observed on the 
side of Mount Vesuvius, 27th April 1849. By A. 
Mitwarp, Esq. Communicated by the Author, 
Synopsis of Meteorological Observations made at 
Whitehaven, Cumberland, in the Year 1848. By 
J.F. Mirier, Esq., F.R.A.S.,&c. Communicated 
by the Author, 
. Account of a Halo observed at Pictou, Nova Scotia, 
August 23, 1849. By J. W. Dawson, Esq. 
Communicated by the Author, : 
Personal Observations on Terraces, and other Proofs 
of Changes in the Relative Level of Sea and 
Land in Scandinavia. By Roperr CHAMBERS, 
Esq., F.R.S.E. and V.PS.A.,Se. (With Plates 
and Map.) Communicated by the Author, 
A Conjecture as to the Forces which produce the Tails 
of Comets. By Witt1am Joun Macauorn Ran- 
KINE, Esq., C.E. Communicated by the Author, 
On Voleanic and Metalliferous Eruptions. By M. 
Evie pe Beaumont. (With a Table), 
On the Different States in which Fossil Vegetables 
are found, 
. Some Particulars respecting the Spheroidal State of 
Bodies ; Proof by Fire ; Man incombustible, &c. 
By M. Bourieny (p’Evrevux.) Read before the 
French Academy of Sciences, 24th May 1849, 
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