CONTENTS. 



PART I. 



I. On a Possible Exphxnatim of the Adaptation of the Eye to Distinct 

 Visim at Different Distances. By James D. Forbes, Esq., F.R.SS. 

 L. & E., Corresponding Member of the Institute of France, and 

 Professor of Natural Philosophy in the University of Edinburgh, 1 



II. On the Modification of the Doubly Refracting and Physical Structure 

 of Topaz, by Elastic Forces emanating from Minute Cavities. By 

 Sir David Beewstek, K.H., D.C.L., F.R.S., and V.P.R.S., 

 Edinburgh, ........•• 7 



III. 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 David Beewstee, K.H., LL.D., F.R.S., and V.P.R.S., Edin., 11 



IV. Account of Experiments upon the Force of the Waves of the Atlantic 

 and German Oceans. By Thomas Stevenson, Esq., Civil En- 

 gineer, Edinburgh. Communicated by David Stevenson, Esq., 23 



V. On the Geology of Cockburnlaw, and the adjoining District, in Berwick- 

 shire. (With a Map and Sections.) By William Stevenson, 

 Dunse. Communicated by David Milne, Esq., ... 33 



VI. On the Extraction ofpwre Phosphoric Acid fro^n Bones, and on a new 

 and anomalous Phosphate of Magnesia. By William Geegoey, 

 M.D., F.R.S.E., Professor of Chemistry in the University of Edin- 

 burgh, ......••■•• ^' 



VII. Miscellaneous Observations on Blood and Milk. By John Davy, M.D., 

 F.R.SS. London and Edinburgh, Inspector-General of Army Hos- 

 pitals, L.R., .53 



vol. XVI. ^ 



