857 ) 



INDEX TO VOL. XXIII. 



A 



Acari, existence of, between the Laminae of Mica in optical contact, 95. 



Aeri/orms, the Law of the Volumes of, 581. 



Agrarian Laws of Lycurgus, 425. 



Allman (Professor). On a Pre-brachial stage in the Development of Comatula, and its importance 



in relation to certain aberrant forms of extinct Crinoids, 241. 

 Arran, great Drift Beds, with shells, in the south of, 523. 

 Atmosphere, Polarisation of, 211. 

 Auriculo-Ventricular Valves, on the structure and action of, 761. 



B 



Beryl, Pressure Cavities in, 39. 



Blackie (Professor). On the Agrarian Laws of Lycurgus, and one of Mr Grote's Canons of His- 

 torical Criticism, 425. 



Brewster (Sir David), K.H. On the pressure cavities in Topaz, Beryl, and Diamond, and their 

 bearing on Geological Theories, 39. 



On the existence of Acari between the Laminse of Mica in optical contact, 95. 



On certain Vegetable and Mineral formations in Calcareous Spar, 97. 



— On the Structure and Optical Phenomena of ancient Decomposed Glass, 193. 



On the Polarisation of Light by rough and white surfaces, 205. 



Observations on the Polarisation of the Atmosphere, made at St Andrews in 1841, 



1842, 1843, 1844, and 1845, 211. 



Description of the Lithoscope, an instrument for distinguishing Precious Stones and 



other bodies, 419. 

 Brown (A. Crum), M.D. On the Theory of Isomeric Compounds, 707. 



c 



Calcareous Spar, certain Vegetable and Mineral formations in, 97. 



Chondr acanthus Lophii, on the Structure of, 67. 



Clio caudata, Zoological Characters of, 185. 



Coelenterata and Molluscoida, Morphological Relationships of, 515. 



Comatula, Pre-brachial stage in the Development of, 241. 



Commensurablrs, on the Theory of, 721. 



Cooling of the Earth, 157. 



D 



Dalmahot (James). On a difficulty in the Theory of Rain, 29. 



Davy (John), M.D., F.R.SS.L. & E. On the Rain-fall in the Lake District in 1861, with some 

 observations on the composition of Rain-water, 53. 



On the freezing of the Egg of the Common Fowl, 505. 



^^OT,. XXIII. PART ni. 10 U 



