1 
1 
iV. 
VI. 
VET. 
CONTENTS. 
PAL 
. On a Possible Explanation of the Adaptation of the Eye to Distinct 
Vision at Different Distances. By JAMEs D. Forses, Esq., F.R.SS. 
L. & E., Corresponding Member of the Institute of France, and 
Professor of Natural Philosophy in the University of Edinburgh, 
On the Modification of the Doubly Refracting and Physical Structure 
of Topaz, by Elastic Forces emanating from Minute Cavities. By 
Sir Davip Brewster, K.H., D.C.L., F.R.S., and V.P.R.S., 
Edinburgh, 
On the Existence of Crystals with different Primitive Forms and Phy- 
sical Properties in the Cavities of Minerals; with additional Observa- 
tions on the New Fluids in which they occur. (With a Plate.) By 
Sir Davip Brewster, K.H., LL.D., F.R.S., and V.P.R.S., Edin., 
Account of Experiments upon the Force of the Waves of the Atlantic 
and German Oceans. By Tuomas STEVENSON, Ksq., Civil En- 
gineer, Edinburgh. Communicated by Davip STEVENSON, Esq., — 
. On the Geology of Cockburnlaw, and the adjoining District, in Berwick- 
shire. (With a Map and Sections.) By WitLiAM STEVENSON, 
Dunse. Communicated by DAvip MILNE, Esq., 
On the Extraction of pure Phosphoric Acid from Bones, and on a new 
and anomalous Phosphate of Magnesia. By WILLIAM GREGORY, 
M.D., F.R.S.E., Professor of Chemistry in the University of Edin- 
burgh, 5 : : : : 4 ‘ 
Miscellaneous Observations on Blood and Milk. By Joun Davy, M.D., 
F.R.SS. London and ities: Inspector-General of Army Hos- 
pitals, L.R., : ‘ ‘ 5 
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