357 



Logan (W. E.) Two letters to the 



Earl Cathcart, 296. 

 liuminous impressions on the eye, on 



the gradual production of, 230. 



.Macdonald (William) M.D.,on the ver- 

 tebral column, and some characters 

 that hare been overlooked in the de- 

 scriptions both orthe anatomist and 

 zoologist, 166. 



Mackenzie (Sir George S.) Bart., on 

 the use of colourless ink in writing, 

 21. 



A few remarks suggested 



by Professor Forbes' description of 

 the effects of glacial action among 

 the CuchuUiu Hills, and Mr Mac- 

 laren's views of the facts observed 

 by him at the Gareloch, 65. 



Speculations re.<!pecting the 



origin of trap-tufiF, the cause of 

 earthquakes, and of partial changes 

 of the bed of the ocean, 114, 115. 



Remarks on the hypothesis of 



progressive development in the oi*- 

 ganic creation, 130. 



Maclagan (Douglas) M.D., and Tilley 

 (Thomas G.) on the constitution of 

 Bebeerine, 46. 



Maclaren (Charles). Notice of an an- 

 cient beach near Stirling, 7. 



on grooved and striated rocks 



in the middle region of Scotland, 

 233. 



Notice respecting a deposit of 



shells near Borrowstounness, 265. 



Madrepores, on the recent Scottish, 

 with remarks on the climatic cha- 

 racter of the extinct races, 82. 



Magnesia, phosphate of, on a new and 

 anomalous, 25. 



Alagnetic instruments, on the thermo- 

 metric correction of, 46. 



needle, on the combined mo- 

 tions of the, and on the aurora bore- 

 alis, 334. 



observatory. Makerstoun. See 



Makerstoun. 



Magnetical instruments self-register- 

 ing, on a method of rendering, 79. 



Makerstoun magnetic observatory, ac- 

 count of the, and observations made 

 there, 10. 



observations, results of the. 



No. I. On the relation of the varia- 

 tion of the earth's magnetism to the 

 solar and lunar periods, 58. 



No. II. On the relation of the 



variations of the vertical component 

 of the earth's magnetic intensity to 

 the solar and lunar periods, 97. 



Makerstoun obscrvationg, results of 

 the. No. III. On the solar and lunar 

 periods of the magnetic declination, 

 144. 



Malta, mud-slide at, description of, 195. 



Manna from New South Wales, on a 

 new species of, 239. 



Mannite, on the extraction of, from 

 the dandelion, 223. 



Marshall (Margaret II.) Experiments 

 and investigations as to the influence 

 exerted over some minerals by ani- 

 mal and vegetable matter, under 

 certain conditions, 59. 



Maxwell (James Clerk), on the descrip- 

 tion of oval curves, and those having 

 a plurality of foci, 89. 



on the equilibrium of elastic 



solids, 294. 



Meteor, account of a remarkable, seen 

 19th December 1849, 309. 



Milk and blood, miscellaneous obser- 

 vations on, 32. 



Milne (David). Notice of polished and 

 striated rocks recently discovered on 

 Arthur's Seat, and in some other 

 places near Edinburgh, 95. 



on the parallel roads of Loch- 



aber, with remarks on the change of 

 relative levels of sea and land in Scot- 

 land, and on the detrital deposits in 

 that country, 124, 132. 



Milward (A.) An attempt to explain 

 the "dirt-bands"' of glaciers, 195. 



description of a mud-slide at 



Malta, 19.5. 



Minerals. Experiments and investi- 

 gations as to the influence exerted 

 over some minerals by animal and 

 vegetable matter, under certain 

 conditions, 59. 



Mirrors and sun-shades of reflecting 

 instruments, determination of the 

 errors arising from non-parallelism 

 in the, 22. 



Moist-bulb hygrometer. See Hygro- 

 meter. 



Molecular vortices, and its application 

 to the mechanical theory of heat, 

 on the hypothesis of, 275. 



Monstrosities, an account of some, 267. 



Morinda citri/otia, on the colouring 

 matter of the, 179. 



Motions, combined, of the magnetic 

 needle, 334. 



Motive power of heat, 241. 



Mud-slide at Malta, description of a, 

 195. 



Muscles, on the influence of contrac- 

 tions of, on the circulation of the 

 blood, 91. 



