Index. 417 



MacGillivray, Professor, on the mammalia of Aberdeenshire, 383. 

 Maclaren, Charles, Esq., F.R.S.E., his outlines of Mr W. Hopkin's 



researches in physical geology, 1st, 2d, and 3d series, 29. 

 Mica-slate, observations on, by M. Gustav Rose, 311. 

 Minerals, new, described, 408. 

 Mongols, observations on, by Bayle St John, Esq., 255. 



Niagara, river, observations on its magnitude, 21. 



Nilotic or Egyptian population, the origm of, by Dr Morton, 305. 



Organic remains, fossil, of extinct animals found only in alluvial 

 deposits, 422. 



Parietin, a yellow colouring matter, described and analysed by Dr 



R. D. Thomson, 193. 

 Patents from March to September, inclusive, 219, 411. 

 Piauzite, a new mineral, 409. 

 Periclase, a new mineral, 409. 



Peruvians (ancient) observations on, by Dr J. J. de Tschudi, 249. 

 Phosphoric acid found in so called igneous rocks, 294. 

 Physeter, whale, fossil remains of, 404. 

 Postans, Captain, on the Biluchi Tribes, 395. 



Rogers, Messrs, on the Transition Rocks of North America, 392. 

 Rowell, G. A., on the cause of the electricity of steam, 347. 



Sang, John, description of an improved apparatus for levelling 



small Theodolites, 182. 

 Sigillaria, observations on, by Mr William King, 62. 

 Sea, call of, described by Mr Richard Edmonds, 403. 

 Solly, Richard, Esq., observations on the motions of earthquakes 



transmitted under the Andes, 183. 

 Sooty deposit on the surface of lakes, 27 — On the surface of the 



sea, off the coast of Devon, 381. 

 Stevenson, David, Esq., Civil Engineer, description of portable 



levelling instruments, 99. 

 Thomas, Esq., Civil Engineer, some account ef levelling 



instruments, with description of one of an improved form, 



101. 



Tangier, the rocks of, described, 406. 



Tschudi, Dr De, on the ancient Peruvians, 249. 



