INDEX. s:->9 



Macdonald (John Denis), R.N., F.R.S., Surgeon of H.M.S. " Icarus." On the Zoological Characters 

 of the Living Clio caudata, as compared with those of Clio borealis given in Systematic Works, 186. 



On the Morphological Relationships of the MoUuscoida and Coelenterata, and of their 



Leading Members, inter se, 515. 



Macvicar (Rev. J. G.), D.D. The Law of the Volumes of Aeriforms extended to Dense Bodies, 581 . 



Magnetic Calms, Earth Currents during, 355. 



MoUuscoida and Coelenterata, on the Morphological Relationships of, 515. 



MuiR (John), D.C.L., LL.D. Some Account of the Recent Progress of Sanskrit Studies, 253. 



On the Principal Deities of the Rigveda, 547- 



N 



Numbers, Theory of, 4 5. 



P 



Parallels, Theory of, 433. 



Petroleum (American), Volatile Constituents of, 491. 



Pettigrew (James B.), M.D. On the Structure and Action of the Auriculo- Ventricular Valves, 



761. 

 Placenta and Umbilical Cord, Structure of, 349. 

 Plummet, Deflection of, due to Solar and Lunar Attraction, 89. • 

 Polarisation of the Atmosphere, 211. 



of Light by rough and white surfaces, 205. 



Pyramid {Great), On the Reputed Metrological System of the, 667. 



R 



Rain, Difficulty in the Theory of, 29. 



Rain-Fall in the Lake District in 1861, 53. 



Rankine (W. J. Macquorn), LL.D. On the Density of Steam, 147. 



Rigveda, on the Principal Deities of the, 547. 



Ronalds (Edmund), Ph.D. On the most Volatile Constituents of American Petroleum, 491. 



s . 



Sang (Edward). On the Deflection of the Plummet due to Solar and Lunar Attraction, 89. 



On the Theory of Commensurables, 721. 



Sanskrit, Recent Progress of, 253. 



Seller (William), M.D. Memoir of the Life and Writings of Robert Whytt, M.D., Professor of 



Medicine in the University of Edinburgh, from 1747 to 1766, 99. 

 Simpson (Professor J. Y.), M.D. On the Anatomical Type of Structure of the Human Umbilical 



Cord and Placenta, 349. 

 Small (John), M.A. Biographical Sketch of Adam Ferguson, LL.D., F.R.S.E., Professor of Moral 



Philosophy in the University of Edinburgh, 599. 

 Smyth (Professor C. Piazzi). On the Great Refracting Telescope at Elchies, in Morayshire, and its 



Powers in Sidereal Observation, 371. 



On the Reputed Metrological System of the Great Pyramid, 667- 



Soil, Expression for the Mean Temperature of a Stratum of, 21. 



Steam, Density of, 147. 



Stewart (Balfour), M.A., F.R.S. On Earth-Currents during Magnetic Calms, and their Connec- 

 tion with Magnetic Changes, 355. 



On Sun-Spots and their Connection with Planetary Configurations, 499. 



Sun-Spots, in connection with Planetary Configurations, 499. 



Superposition, 471. 



